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Old 01-16-2019, 09:08 PM   #15
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I thought with FI lower compression ratio was better?
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Old 01-17-2019, 07:59 AM   #16
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Originally Posted by SSE 4 2SS View Post
My motor is 10.5-1, 3.9 stroker. Twin 76/75 CEA turbos... As hillshooter mentioned, it makes stupid power, 1200 RWHP at 12 lbs (spring pressure), 2000 RWHP at 27 lbs of boost, and we can go to 35, just haven't put all the pieces together at the track yet.... We do spin this motor to 9000 RPM.... she starts making power at 6000 rpm....


Thanks for everyones advice. There's another guy on here with the same blower as me in his C6, running 9.7 @144. His builder keep the compression stock when they upgraded the pistons/rods. I think I will be happy with 10.5:1, as it seems most common to keep compression near stock.
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Old 01-17-2019, 09:12 AM   #17
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Thanks for everyones advice. There's another guy on here with the same blower as me in his C6, running 9.7 @144. His builder keep the compression stock when they upgraded the pistons/rods. I think I will be happy with 10.5:1, as it seems most common to keep compression near stock.
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Old 01-17-2019, 02:57 PM   #18
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Thanks for everyones advice. There's another guy on here with the same blower as me in his C6, running 9.7 @144. His builder keep the compression stock when they upgraded the pistons/rods. I think I will be happy with 10.5:1, as it seems most common to keep compression near stock.
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If you can turn, you ain't going fast enough...
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Old 01-18-2019, 05:37 PM   #19
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I thought with FI lower compression ratio was better?
Maybe on an old school 350 or big block 454, but not so much with modern engines and electronics, you really don't need to go below 10:1.
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Old 01-20-2019, 08:56 AM   #20
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I cant really swing a new short block having just bought a new house and the remodeling that comes with it. So in order to crank this thing up a notch, I'm going the least expensive route, and gonna drop some pistons and rods into my stock block/crank.

I'm pretty sure I'm going with Wiseco, but I don't know what compression to shoot for.

I'm looking for a reliable weekend/street/track car that makes around 1000whp.

My options in 4.07 bore are -3.2cc and -11cc. Where will those pistons land me compression wise?

Which is most ideal for a centrifugal supercharger setup?

Since I have a tight budget, should I go with an H beam, or even a Scat I beam?
All these answers....and not one person has asked what fuel you'll be using. Strange.

Molnars XD rods look very nice and keenly priced.

Diamond make very good pistons too, as do JE. For some reason, I just dont like Wiseco so much. Probably not justified, but their pistons just never seem as well made as some other brands.

If you have good fuel available, ethanol or whatever...by all means push for that high CR.

If not, and it's a pump fuel setup, I'd be playing safe in the 9's. You'll never feel the difference, but the engine will nowhere near the edge.
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Old 01-20-2019, 10:11 AM   #21
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All these answers....and not one person has asked what fuel you'll be using. Strange.



Molnars XD rods look very nice and keenly priced.



Diamond make very good pistons too, as do JE. For some reason, I just dont like Wiseco so much. Probably not justified, but their pistons just never seem as well made as some other brands.



If you have good fuel available, ethanol or whatever...by all means push for that high CR.



If not, and it's a pump fuel setup, I'd be playing safe in the 9's. You'll never feel the difference, but the engine will nowhere near the edge.
U will feel the difference between 9s and mid 10s on compression. The difference will be torque when your not in boost. I would rather have more torque when not in boost than not. And mid 10s will make that power a lil faster as it has less cylinder to fill. Neither you will probably notice in real world. But i would rather have higher compression than lower, with more torque than less when not in boost, and a good tuner that dont mind tuning and comfortable with tuning at 10.5ish compression and not afraid to turn it up as long as the fuel and mods support it

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Old 01-20-2019, 10:16 AM   #22
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"Best" compression is dependent on multiple factors. There is no one answer for every build. Should look at dynamic as well as static, and the camshaft choice plays into things as well as fuel choices.
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Old 01-20-2019, 10:53 AM   #23
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What kind of fuel?

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E85. Its about 77% locally and easy to access.
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All these answers....and not one person has asked what fuel you'll be using. Strange.

Molnars XD rods look very nice and keenly priced.

Diamond make very good pistons too, as do JE. For some reason, I just dont like Wiseco so much. Probably not justified, but their pistons just never seem as well made as some other brands.

If you have good fuel available, ethanol or whatever...by all means push for that high CR.

If not, and it's a pump fuel setup, I'd be playing safe in the 9's. You'll never feel the difference, but the engine will nowhere near the edge.
Im actually leaning toward a Mahle coated piston at the moment. My 34k mile block should be fine with the stock bore, and Mahle offers a nice piston in 4.065.

Yea i know, I should at least go 4.07, and the next guy says I should sleeve it, then the next guy says go iron, then aftermarket... In the end I always do what I want and usually get away with it!

Thanks for the suggestions. Im sticking with 10.5ish
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Old 01-20-2019, 12:08 PM   #24
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U will feel the difference between 9s and mid 10s on compression. The difference will be torque when your not in boost. I would rather have more torque when not in boost than not. And mid 10s will make that power a lil faster as it has less cylinder to fill. Neither you will probably notice in real world. But i would rather have higher compression than lower, with more torque than less when not in boost, and a good tuner that dont mind tuning and comfortable with tuning at 10.5ish compression and not afraid to turn it up as long as the fuel and mods support it

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On a 1000hp build...you will never feel the difference in 1 point of compression, but your engine will be under less stress with the reduction.
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Old 01-22-2019, 02:00 PM   #25
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I am running 9.5:1 on my 427 on about 15lbs of boost on E-85 had I originally planned on E-85 it would be closer to 10:1. I also plan on going 20+lbs boost in the future though
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Old 02-19-2019, 07:16 AM   #26
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Scat Pro H Beams

I'm bumping this thread back up, not for the compression ratio conversation, but to get everyone's opinion on Scat Pro H Beam connecting rods.

They are very affordable, and that usually means to stay clear. However, I reached out to Scat and they claim the Pro H Beam rods with arp 2000 bolts have a HP rating of "around 1000". Most of my google search results show people are satisfied with them, no carnage posts.

While the H beam is probably heavier than the TSP Super I Beam, they are about $350 cheaper. While thats not a lot of money to most, I can do alot with it. Like arp head bolts and gaskets.

Anyone actually running a Scat Pro H beam? Or have horror stories?

I used their I beam in my sbf stroker and it still going....
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Old 02-19-2019, 11:19 AM   #27
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Molnars XD's seem very keenly priced and are popular.
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Old 02-19-2019, 12:26 PM   #28
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I use molnar turbo rods and molnar crank, love that combo

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