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Discussing Compression ratio w/supercharger in the 99-04 Forum. I am looking at building my engine this winter/spring, and was looking at also ...

       

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Old September 16th, 2007, 12:04 PM   #1
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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.
 
Old September 16th, 2007, 12:44 PM   #2
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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
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if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 12:47 PM   #3
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I was planning on a KB. So is 9.5:1 too high with a KB then???
 
Old September 16th, 2007, 12:48 PM   #4
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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.
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 12:50 PM   #5
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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!
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Old September 16th, 2007, 01:01 PM   #6
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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.
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 01:16 PM   #7
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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).
 
Old September 16th, 2007, 01:18 PM   #8
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if thats the power your wanting, regular forged parts will be fine. bllet stuff is needed if your wanting over 1000
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 01:19 PM   #9
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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?
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 01:22 PM   #10
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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
 
Old September 16th, 2007, 01:23 PM   #11
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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!
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Old September 16th, 2007, 01:28 PM   #12
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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
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 01:34 PM   #13
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If I get something besides a KB it will be a TT setup. What is an ideal TT compression ratio???
 
Old September 16th, 2007, 01:37 PM   #14
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8.5-9.0
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 01:39 PM   #15
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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?
 
Old September 16th, 2007, 01:42 PM   #16
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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
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 01:56 PM   #17
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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?
 
Old September 16th, 2007, 02:04 PM   #18
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Bigger Combustion chamber in the head lowers compression. There is more space to combust in.
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We expect shit to break, look foward to realizing exactly when it is happening, and than obsess about dropping plenty of cash to rebuild stronger, so we can try to run it hard as hell and break again. We are sick individuals.
 
Old September 16th, 2007, 02:09 PM   #19
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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
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Originally Posted by BWAL09 View Post
if i had a cobra R, i'd take out the vents and put little miniature fish tanks in their places and fill them with sea monkeys
 
Old September 16th, 2007, 02:10 PM   #20
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Right on, thanks guys! I love this forum!
 
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