More New Scrambler Details
#181
Guest
Posts: n/a
Re: More New Scrambler Details
didn't make myself clear - I meant turbo engines in general (e.g. Ford
Cosworth, Subaru Imprezza turbo are both 8:1)
--
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"DougW" <post.replies@invalid.address> wrote in message
news:MADhb.18245$Qo.9402@news2.central.***.net...
: Dave Milne did pass the time by typing:
: > if it's not spun up, you are driving a 8:1 low compression engine..
:
: 4.0l HO is 8.8:1 actually :) I stuff another 5.5psi into it with
: just the stock pulley. Any more and it would need intercooling or
: larger injectors.
:
: I use a eaton, roots type, blower, always turning even at idle. The good
: part is it doesn't heat the air near as much as a vane charger like the
: paxton does.
:
: > "L.W. (ßill) ------ III" wrote ...
: >> Plus your blower gives you power instantly, no lag time like a
: >> turbo, they have to count one thousand one, one thousand two, before
: >> anything happens. On a five speed they spend more time un-powered upon
: >> shifts as I do to clear the whole quarter mile drag.
:
: >> DougW wrote:
: >>> Which is why I stuffed a blower on the 4.0 :)
: >>> Turbos are good for high RPM boost but superchargers give
: >>> you low end umph.
: >>>
: >>> I rilly want to stroke it out to 4.7, but that's going to have
: >>> to wait.
: >>>
: >>> --
: >>> -- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
: >>> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
: >>> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
:
:
:
Cosworth, Subaru Imprezza turbo are both 8:1)
--
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"DougW" <post.replies@invalid.address> wrote in message
news:MADhb.18245$Qo.9402@news2.central.***.net...
: Dave Milne did pass the time by typing:
: > if it's not spun up, you are driving a 8:1 low compression engine..
:
: 4.0l HO is 8.8:1 actually :) I stuff another 5.5psi into it with
: just the stock pulley. Any more and it would need intercooling or
: larger injectors.
:
: I use a eaton, roots type, blower, always turning even at idle. The good
: part is it doesn't heat the air near as much as a vane charger like the
: paxton does.
:
: > "L.W. (ßill) ------ III" wrote ...
: >> Plus your blower gives you power instantly, no lag time like a
: >> turbo, they have to count one thousand one, one thousand two, before
: >> anything happens. On a five speed they spend more time un-powered upon
: >> shifts as I do to clear the whole quarter mile drag.
:
: >> DougW wrote:
: >>> Which is why I stuffed a blower on the 4.0 :)
: >>> Turbos are good for high RPM boost but superchargers give
: >>> you low end umph.
: >>>
: >>> I rilly want to stroke it out to 4.7, but that's going to have
: >>> to wait.
: >>>
: >>> --
: >>> -- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
: >>> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
: >>> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
:
:
:
#182
Guest
Posts: n/a
Re: More New Scrambler Details
didn't make myself clear - I meant turbo engines in general (e.g. Ford
Cosworth, Subaru Imprezza turbo are both 8:1)
--
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"DougW" <post.replies@invalid.address> wrote in message
news:MADhb.18245$Qo.9402@news2.central.***.net...
: Dave Milne did pass the time by typing:
: > if it's not spun up, you are driving a 8:1 low compression engine..
:
: 4.0l HO is 8.8:1 actually :) I stuff another 5.5psi into it with
: just the stock pulley. Any more and it would need intercooling or
: larger injectors.
:
: I use a eaton, roots type, blower, always turning even at idle. The good
: part is it doesn't heat the air near as much as a vane charger like the
: paxton does.
:
: > "L.W. (ßill) ------ III" wrote ...
: >> Plus your blower gives you power instantly, no lag time like a
: >> turbo, they have to count one thousand one, one thousand two, before
: >> anything happens. On a five speed they spend more time un-powered upon
: >> shifts as I do to clear the whole quarter mile drag.
:
: >> DougW wrote:
: >>> Which is why I stuffed a blower on the 4.0 :)
: >>> Turbos are good for high RPM boost but superchargers give
: >>> you low end umph.
: >>>
: >>> I rilly want to stroke it out to 4.7, but that's going to have
: >>> to wait.
: >>>
: >>> --
: >>> -- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
: >>> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
: >>> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
:
:
:
Cosworth, Subaru Imprezza turbo are both 8:1)
--
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"DougW" <post.replies@invalid.address> wrote in message
news:MADhb.18245$Qo.9402@news2.central.***.net...
: Dave Milne did pass the time by typing:
: > if it's not spun up, you are driving a 8:1 low compression engine..
:
: 4.0l HO is 8.8:1 actually :) I stuff another 5.5psi into it with
: just the stock pulley. Any more and it would need intercooling or
: larger injectors.
:
: I use a eaton, roots type, blower, always turning even at idle. The good
: part is it doesn't heat the air near as much as a vane charger like the
: paxton does.
:
: > "L.W. (ßill) ------ III" wrote ...
: >> Plus your blower gives you power instantly, no lag time like a
: >> turbo, they have to count one thousand one, one thousand two, before
: >> anything happens. On a five speed they spend more time un-powered upon
: >> shifts as I do to clear the whole quarter mile drag.
:
: >> DougW wrote:
: >>> Which is why I stuffed a blower on the 4.0 :)
: >>> Turbos are good for high RPM boost but superchargers give
: >>> you low end umph.
: >>>
: >>> I rilly want to stroke it out to 4.7, but that's going to have
: >>> to wait.
: >>>
: >>> --
: >>> -- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
: >>> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
: >>> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
:
:
:
#183
Guest
Posts: n/a
Re: More New Scrambler Details
All super charged engines run low compression for greater volume.
More gas, more air in the chamber equals more power.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Dave Milne wrote:
>
> didn't make myself clear - I meant turbo engines in general (e.g. Ford
> Cosworth, Subaru Imprezza turbo are both 8:1)
> --
> Dave Milne, Scotland
> '99 TJ 4.0 Sahara
More gas, more air in the chamber equals more power.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Dave Milne wrote:
>
> didn't make myself clear - I meant turbo engines in general (e.g. Ford
> Cosworth, Subaru Imprezza turbo are both 8:1)
> --
> Dave Milne, Scotland
> '99 TJ 4.0 Sahara
#184
Guest
Posts: n/a
Re: More New Scrambler Details
All super charged engines run low compression for greater volume.
More gas, more air in the chamber equals more power.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Dave Milne wrote:
>
> didn't make myself clear - I meant turbo engines in general (e.g. Ford
> Cosworth, Subaru Imprezza turbo are both 8:1)
> --
> Dave Milne, Scotland
> '99 TJ 4.0 Sahara
More gas, more air in the chamber equals more power.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Dave Milne wrote:
>
> didn't make myself clear - I meant turbo engines in general (e.g. Ford
> Cosworth, Subaru Imprezza turbo are both 8:1)
> --
> Dave Milne, Scotland
> '99 TJ 4.0 Sahara
#185
Guest
Posts: n/a
Re: More New Scrambler Details
All super charged engines run low compression for greater volume.
More gas, more air in the chamber equals more power.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Dave Milne wrote:
>
> didn't make myself clear - I meant turbo engines in general (e.g. Ford
> Cosworth, Subaru Imprezza turbo are both 8:1)
> --
> Dave Milne, Scotland
> '99 TJ 4.0 Sahara
More gas, more air in the chamber equals more power.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Dave Milne wrote:
>
> didn't make myself clear - I meant turbo engines in general (e.g. Ford
> Cosworth, Subaru Imprezza turbo are both 8:1)
> --
> Dave Milne, Scotland
> '99 TJ 4.0 Sahara
#186
Guest
Posts: n/a
Re: More New Scrambler Details
True, and also to keep the heat => early detonation down.
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F870EB7.83C5B612@***.net...
: All super charged engines run low compression for greater volume.
: More gas, more air in the chamber equals more power.
: God Bless America, ßill O|||||||O
: mailto:-------------------- http://www.----------.com/
:
: Dave Milne wrote:
: >
: > didn't make myself clear - I meant turbo engines in general (e.g. Ford
: > Cosworth, Subaru Imprezza turbo are both 8:1)
: > --
: > Dave Milne, Scotland
: > '99 TJ 4.0 Sahara
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F870EB7.83C5B612@***.net...
: All super charged engines run low compression for greater volume.
: More gas, more air in the chamber equals more power.
: God Bless America, ßill O|||||||O
: mailto:-------------------- http://www.----------.com/
:
: Dave Milne wrote:
: >
: > didn't make myself clear - I meant turbo engines in general (e.g. Ford
: > Cosworth, Subaru Imprezza turbo are both 8:1)
: > --
: > Dave Milne, Scotland
: > '99 TJ 4.0 Sahara
#187
Guest
Posts: n/a
Re: More New Scrambler Details
True, and also to keep the heat => early detonation down.
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F870EB7.83C5B612@***.net...
: All super charged engines run low compression for greater volume.
: More gas, more air in the chamber equals more power.
: God Bless America, ßill O|||||||O
: mailto:-------------------- http://www.----------.com/
:
: Dave Milne wrote:
: >
: > didn't make myself clear - I meant turbo engines in general (e.g. Ford
: > Cosworth, Subaru Imprezza turbo are both 8:1)
: > --
: > Dave Milne, Scotland
: > '99 TJ 4.0 Sahara
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F870EB7.83C5B612@***.net...
: All super charged engines run low compression for greater volume.
: More gas, more air in the chamber equals more power.
: God Bless America, ßill O|||||||O
: mailto:-------------------- http://www.----------.com/
:
: Dave Milne wrote:
: >
: > didn't make myself clear - I meant turbo engines in general (e.g. Ford
: > Cosworth, Subaru Imprezza turbo are both 8:1)
: > --
: > Dave Milne, Scotland
: > '99 TJ 4.0 Sahara
#188
Guest
Posts: n/a
Re: More New Scrambler Details
True, and also to keep the heat => early detonation down.
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F870EB7.83C5B612@***.net...
: All super charged engines run low compression for greater volume.
: More gas, more air in the chamber equals more power.
: God Bless America, ßill O|||||||O
: mailto:-------------------- http://www.----------.com/
:
: Dave Milne wrote:
: >
: > didn't make myself clear - I meant turbo engines in general (e.g. Ford
: > Cosworth, Subaru Imprezza turbo are both 8:1)
: > --
: > Dave Milne, Scotland
: > '99 TJ 4.0 Sahara
Dave Milne, Scotland
'99 TJ 4.0 Sahara
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F870EB7.83C5B612@***.net...
: All super charged engines run low compression for greater volume.
: More gas, more air in the chamber equals more power.
: God Bless America, ßill O|||||||O
: mailto:-------------------- http://www.----------.com/
:
: Dave Milne wrote:
: >
: > didn't make myself clear - I meant turbo engines in general (e.g. Ford
: > Cosworth, Subaru Imprezza turbo are both 8:1)
: > --
: > Dave Milne, Scotland
: > '99 TJ 4.0 Sahara
#189
Guest
Posts: n/a
Re: More New Scrambler Details
"DougW" <post.replies@invalid.address> wrote in message
news:u4Chb.17849$Qo.13190@news2.central.***.net...
>
> Which is why I stuffed a blower on the 4.0 :)
> Turbos are good for high RPM boost but superchargers give
> you low end umph.
Depends on the design. Many turbo designs can develop lots of boost at
relatively low rpms. This is the whole point behind twin sequential turbos.
2 smaller turbos can spin up at lower exhaust gas pressures than one larger
one. Also, a centrifugal supercharger needs high rpm to build up decent
pressure too.
I have owned 2 different SAAB 9000 full pressure turbos. They both develop
full boost by the time they reach ~2500 rpm. They have a considerable
amount of torque for their low 2.4 liter displacements. 225 Hp and 258
ft/lbs in stock trim and with a chip they can be coaxed to 260 Hp and 287
ft/lbs easily with no other modifications. These engines were very torquey
and did not have very high redlines.
They are also not high tech engines made from unobtanium. They were early
'90's vintage engines that routinely ran 250-300k miles with only a timing
chain or head gasket in the interim. But the engines were designed with
forced induction in mind, unlike strapping a blower on a pushrod V-8.
What I'd really like to do is put a modified roots type blower on an 8
cylinder 4.5 liter BMW engine (which makes ~280 hp 320 ft/lbs normally
aspirated). I'm sure that would be more than a handful.
-Fred W
---
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#190
Guest
Posts: n/a
Re: More New Scrambler Details
"DougW" <post.replies@invalid.address> wrote in message
news:u4Chb.17849$Qo.13190@news2.central.***.net...
>
> Which is why I stuffed a blower on the 4.0 :)
> Turbos are good for high RPM boost but superchargers give
> you low end umph.
Depends on the design. Many turbo designs can develop lots of boost at
relatively low rpms. This is the whole point behind twin sequential turbos.
2 smaller turbos can spin up at lower exhaust gas pressures than one larger
one. Also, a centrifugal supercharger needs high rpm to build up decent
pressure too.
I have owned 2 different SAAB 9000 full pressure turbos. They both develop
full boost by the time they reach ~2500 rpm. They have a considerable
amount of torque for their low 2.4 liter displacements. 225 Hp and 258
ft/lbs in stock trim and with a chip they can be coaxed to 260 Hp and 287
ft/lbs easily with no other modifications. These engines were very torquey
and did not have very high redlines.
They are also not high tech engines made from unobtanium. They were early
'90's vintage engines that routinely ran 250-300k miles with only a timing
chain or head gasket in the interim. But the engines were designed with
forced induction in mind, unlike strapping a blower on a pushrod V-8.
What I'd really like to do is put a modified roots type blower on an 8
cylinder 4.5 liter BMW engine (which makes ~280 hp 320 ft/lbs normally
aspirated). I'm sure that would be more than a handful.
-Fred W
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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