Compression ratio w/supercharger

TheBusher · September 16th, 2007, 12:04 PM

I am looking at building my engine this winter/spring, and was looking at also getting a stroker billet kit (along with a bunch of other goodies!)on VT's website. The lowest compression ratio I can find on there is 9.5:1. Is that low enough for a supercharger, cause I've always heard 8.5-9.0 is ideal for a supercharger.

Drgnracin72 · September 16th, 2007, 12:44 PM

what kind of supercharger are you going to run. 9.5 with a centrifugal blower will be perfect, you dont want low compression with them, as for turbo and twin screw though, youll want 8.5-9.0 with them

TheBusher · September 16th, 2007, 12:47 PM

I was planning on a KB. So is 9.5:1 too high with a KB then???

Drgnracin72 · September 16th, 2007, 12:48 PM

yeah youd be better off going with 8.5, a stage 2 head plus a 18-20 cc dish in the pistons should do plenty to get that compression down low enough.

MustangMatt96GT · September 16th, 2007, 12:50 PM

not optumal. You could put SVO heads on there that would have a NPI size combustion chamber and get down less than 9.0:1 but that for the heads and intake is like 3 grand by them selfs! You could also just keep the stock stroke with forged rods, crank, and dished pistons that would make it optimal!

Drgnracin72 · September 16th, 2007, 01:01 PM

i think you should do the higer compression, with the centri blower, till make more top en power (where you want it) and it will make for a faster car. kb are over rated and are a band aid for low compression. stick with the centri if ya want a faster car.

TheBusher · September 16th, 2007, 01:16 PM

I was planning on getting VT stage 2 heads, crower stage 2 or 3 (haven't decided yet) blower cam, crower springs and retainers (titanium), I was also thinking about crower valves (any recommendations would be nice).

Also what the difference between 44.5mm and 45.5mm (+1mm), and 36mm and 37mm (+1mm)???

Any recommendations on stroker rotating assemblies??? I would prefer billet because it is stronger. Eventually I plan on making a ton a power (700+ rwhp).

Drgnracin72 · September 16th, 2007, 01:18 PM

if thats the power your wanting, regular forged parts will be fine. bllet stuff is needed if your wanting over 1000

Drgnracin72 · September 16th, 2007, 01:19 PM

Originally Posted by TheBusher

Also what the difference between 44.5mm and 45.5mm (+1mm), and 36mm and 37mm (+1mm)???

.

what are these numbers for?

TheBusher · September 16th, 2007, 01:22 PM

Originally Posted by drgnracin72

Originally Posted by TheBusher

Also what the difference between 44.5mm and 45.5mm (+1mm), and 36mm and 37mm (+1mm)???

.

what are these numbers for?

Sorry, it's for the valves...

http://www.vtengines.com/store/index...roducts_id=110

http://www.vtengines.com/store/index...roducts_id=111

http://www.vtengines.com/store/index...roducts_id=108

http://www.vtengines.com/store/index...roducts_id=109

MustangMatt96GT · September 16th, 2007, 01:23 PM

Those are for the size of the valves. And it might help you out with a blower, but they are expensive to gain only 20 HP tops. And well dont buy the crower stuff from VT I orders the titanuium valvesprings and retianers Aug 17, 2007 and have yet to recieve anything. They keep blameing it on crower. But havent offered me a refund or a discount or anything.

And dude im telling you go the centri way!

Drgnracin72 · September 16th, 2007, 01:28 PM

centri si the way, just go with whatever valves come in the head, theyve been researhed and proven to work fine with the combo. i wont ever order form vt again, i had problems when i ordered my heads from them

TheBusher · September 16th, 2007, 01:34 PM

If I get something besides a KB it will be a TT setup. What is an ideal TT compression ratio???

Drgnracin72 · September 16th, 2007, 01:37 PM

8.5-9.0

TheBusher · September 16th, 2007, 01:39 PM

Originally Posted by drgnracin72

8.5-9.0

So, any suggestions on a good rotating assembly that will put me at 8.5-9.0? Or would it be easier to purchase the parts seperately?

Drgnracin72 · September 16th, 2007, 01:42 PM

anything with a dish around 15 or bigger, with a bigger head will put you real close to what your wanting. im running a 21cc dish piston with vt stage 2 heads and i am right around 8.5:1

TheBusher · September 16th, 2007, 01:56 PM

Thanks! Now this may be a dumb question but, are blower cams also good for turbos, or not? If not, who makes a good turbo cam???

Another dumb question but, how does having a bigger head lower compression?

MustangMatt96GT · September 16th, 2007, 02:04 PM

Bigger Combustion chamber in the head lowers compression. There is more space to combust in.

Drgnracin72 · September 16th, 2007, 02:09 PM

a blower cam isnc ompletely different form a turbo cam, i would contact a place like vt or some place that will custom build a turbo cam for you

TheBusher · September 16th, 2007, 02:10 PM

Right on, thanks guys! I love this forum!

September 16th, 2007, 12:04 PM	#1
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	Compression ratio w/supercharger I am looking at building my engine this winter/spring, and was looking at also getting a stroker billet kit (along with a bunch of other goodies!)on VT's website. The lowest compression ratio I can find on there is 9.5:1. Is that low enough for a supercharger, cause I've always heard 8.5-9.0 is ideal for a supercharger.

September 16th, 2007, 12:44 PM	#2
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	what kind of supercharger are you going to run. 9.5 with a centrifugal blower will be perfect, you dont want low compression with them, as for turbo and twin screw though, youll want 8.5-9.0 with them __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 12:48 PM	#4
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	yeah youd be better off going with 8.5, a stage 2 head plus a 18-20 cc dish in the pistons should do plenty to get that compression down low enough. __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 12:50 PM	#5
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,690 iTrader: 3 reviews	not optumal. You could put SVO heads on there that would have a NPI size combustion chamber and get down less than 9.0:1 but that for the heads and intake is like 3 grand by them selfs! You could also just keep the stock stroke with forged rods, crank, and dished pistons that would make it optimal! __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

September 16th, 2007, 01:01 PM	#6
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	i think you should do the higer compression, with the centri blower, till make more top en power (where you want it) and it will make for a faster car. kb are over rated and are a band aid for low compression. stick with the centri if ya want a faster car. __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 12:47 PM	#3
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	I was planning on a KB. So is 9.5:1 too high with a KB then???

September 16th, 2007, 01:16 PM	#7
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	I was planning on getting VT stage 2 heads, crower stage 2 or 3 (haven't decided yet) blower cam, crower springs and retainers (titanium), I was also thinking about crower valves (any recommendations would be nice). Also what the difference between 44.5mm and 45.5mm (+1mm), and 36mm and 37mm (+1mm)??? Any recommendations on stroker rotating assemblies??? I would prefer billet because it is stronger. Eventually I plan on making a ton a power (700+ rwhp).

September 16th, 2007, 01:18 PM	#8
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	if thats the power your wanting, regular forged parts will be fine. bllet stuff is needed if your wanting over 1000 __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 01:23 PM	#11
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,690 iTrader: 3 reviews	Those are for the size of the valves. And it might help you out with a blower, but they are expensive to gain only 20 HP tops. And well dont buy the crower stuff from VT I orders the titanuium valvesprings and retianers Aug 17, 2007 and have yet to recieve anything. They keep blameing it on crower. But havent offered me a refund or a discount or anything. And dude im telling you go the centri way! __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

September 16th, 2007, 01:28 PM	#12
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	centri si the way, just go with whatever valves come in the head, theyve been researhed and proven to work fine with the combo. i wont ever order form vt again, i had problems when i ordered my heads from them __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 01:34 PM	#13
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	If I get something besides a KB it will be a TT setup. What is an ideal TT compression ratio???

September 16th, 2007, 01:37 PM	#14
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	8.5-9.0 __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 01:42 PM	#16
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	anything with a dish around 15 or bigger, with a bigger head will put you real close to what your wanting. im running a 21cc dish piston with vt stage 2 heads and i am right around 8.5:1 __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 01:56 PM	#17
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	Thanks! Now this may be a dumb question but, are blower cams also good for turbos, or not? If not, who makes a good turbo cam??? Another dumb question but, how does having a bigger head lower compression?

September 16th, 2007, 02:04 PM	#18
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,690 iTrader: 3 reviews	Bigger Combustion chamber in the head lowers compression. There is more space to combust in. __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

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September 16th, 2007, 02:09 PM	#19
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	a blower cam isnc ompletely different form a turbo cam, i would contact a place like vt or some place that will custom build a turbo cam for you __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 16th, 2007, 02:10 PM	#20
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	Right on, thanks guys! I love this forum!

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