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| HP from Compression change https://slantsix.org/forum/viewtopic.php?t=65811 |
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| Author: | Rick Covalt [ Sat Feb 27, 2021 5:52 pm ] |
| Post subject: | HP from Compression change |
Just thinking out loud a little. I have @ 260HP at an 11.5 to CR. If I bump that up a point to 12.5 to 1, what is the HP increase I could expect. I did check on the Wallace Calculators and it literally said only 1 HP increase!  Can that be true? I just assumed that it would be more than that. If it is not then I'll never increase mine. Thanks for thoughts! |
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| Author: | emsvitil [ Sat Feb 27, 2021 6:29 pm ] |
| Post subject: | Re: HP from Compression chabge |
It's diminishing returns the higher you go. Try this one: http://victorylibrary.com/brit/compression-c.htm |
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| Author: | Rick Covalt [ Sun Feb 28, 2021 4:44 am ] |
| Post subject: | Re: HP from Compression chabge |
Thanks Ed. That one shows about 2.5% Change |
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| Author: | Dart270 [ Sun Feb 28, 2021 6:15 am ] |
| Post subject: | Re: HP from Compression chabge |
Depends on other things you optimize for each CR, like ign curve, fuel type, induction, engine operating temp... But yes, diminishing returns as you go up. 2.5% sounds reasonable, although I bet you could get more if you do the work on other parts of your engine/operation. Lou |
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| Author: | Badvert65 [ Sun Feb 28, 2021 6:18 am ] |
| Post subject: | Re: HP from Compression chabge |
I am curious, at what static compression ratio should you start being concerned about head gasket sealing? |
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| Author: | Rick Covalt [ Sun Feb 28, 2021 8:40 am ] |
| Post subject: | Re: HP from Compression chabge |
Quote: at what static compression ratio should you start being concerned about head gasket sealing?
I had always heard keep it under 12 to 1 or you will start having issue. Therefore I am at 11.5 with the good Aussie gasket.Ryan's car 11.00/118 mph, and has probably been run as hard as most racers will run, is at 13.3 to 1. He was running a MLS gasket on it and we had to pull the head and the only gasket we had to put back on was the Aussie gasket. It ran that full season (2019) and is still in the car right now. So in this case it will take more than 12 to 1. Your results may vary! 
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| Author: | Dart270 [ Sun Feb 28, 2021 12:26 pm ] |
| Post subject: | Re: HP from Compression chabge |
Endurotec supposedly good up to 12:1. I imagine it can go higher, and you could use O-rings. I have run up to 11.1:1 w/mine. Lou |
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| Author: | slantzilla [ Sun Feb 28, 2021 6:27 pm ] |
| Post subject: | Re: HP from Compression chabge |
I believe higher compression makes more torque. |
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| Author: | volaredon [ Sun Feb 28, 2021 7:33 pm ] |
| Post subject: | Re: HP from Compression chabge |
on a given engine, all else being the same, is there any such info about a CR increase on an "as found"/stock engine, or a recently (correctly) rebuilt to stock specs engine? CR in stock form? CR upped a 1/2 a point at a time, to the limits of pump gas? how much of a power adder would "X" amount of compression, be? looking at rough guesstimates, I know that adding different carb or FI, different manifolds, cams, or various amounts of porting, bigger valves, exhaust, start to play in at some point.... but if all a person did was pull the head, shave to a known extent, and reinstall, how much increase would they (POSSIBLY) get.... (not so much asking for me, but as often as a head shave is suggested/ and as often as "best performance upgrade" is asked around here by many, I'm sure those ask-ers might be wondering how much gain, for how much effort) |
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| Author: | Greg Ondayko [ Mon Mar 01, 2021 5:20 am ] |
| Post subject: | Re: HP from Compression chabge |
Quote: Endurotec supposedly good up to 12:1. I imagine it can go higher, and you could use O-rings. I have run up to 11.1:1 w/mine.
Lou Endourotec can probably support 14:1 - I have run 13.5:1 on mine. Greg |
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| Author: | Dart270 [ Tue Mar 02, 2021 5:42 am ] |
| Post subject: | Re: HP from Compression change |
Good to know about the high CR on Greg and Ryan's cars. O-ring aid, or just plain gasket? Lou |
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| Author: | Rick Covalt [ Tue Mar 02, 2021 7:01 am ] |
| Post subject: | Re: HP from Compression change |
Plain gasket on Ryan's. |
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| Author: | Greg Ondayko [ Tue Mar 02, 2021 10:05 am ] |
| Post subject: | Re: HP from Compression change |
Quote: Good to know about the high CR on Greg and Ryan's cars. O-ring aid, or just plain gasket?
Lou Just a gasket on ruster. No O Rings. Greg |
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