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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi compression,alky and tuning woindowGo | New | Find | Notify | Tools | Reply | |
| compression,alky and tuning woindow | Login/Join |
DRR Top Comp |
Have read quite a few comments here about tuning window and compression with alky. Seems most thik tunig window is bigger with less compression. Since finally got new pistons which are are higher compression and .125 bigger. Wondering how much it changes with compression. Compression can be 13 to 15:1 depending on shich set of gaskets i throm on engine. While good amount of power from low compression to higher. Bigger bore power gain remains either way. Just the heads up tuner built into me hated to give up power,but guess in bracket consistency with less sensitive tune is better. So opions of compression and range for tune? America home of free. Brought to you by 2nd amendment. | ||
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DRR S/Pro |
I was told to go 14:1 when I built my conventional head Chevy 632, so that’s what I did. Tony Leonard | |||
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DRR Top Comp |
I typically like to run around 14 to 1. I have ran alcohol as low as 9.6 compression and it worked well, picked up a lot over gas. On the 463 Cu. In. SBC I am building the piston, heads and cam manufacturer all recommend 16 to 1 so that is what I am doing on this one. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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| DRR Top Comp |
I could probably get 16 with a .040 gasket.Also probably need lilt clearance on outer e.dge of piston.Luckily I have adjustable ring compressor and using thaw will allow me to chuck pistons in lathe and cut the .005 to .010 needed. America home of free. Brought to you by 2nd amendment. | |||
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| DRR Top Comp |
still looking for info on tuning window if larger with less compression America home of free. Brought to you by 2nd amendment. | |||
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| DRR Top Comp |
Yes, Tuning window is wider with lower compression, peak horsepower should be better with the higher compression. (with in reason) https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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| DRR Top Comp |
Problem with ton of com pression with hemi is dome. Like BBC and guess sbc to lesser degree. Craming all the dome one can will hender flame travel some, Like most indexing plug will help. Different method for that too. Most of compression increase here came fro valve pockets,Ordered piston with no clearance and cut what I needed on mill. Bigger bore helped a lot since the bigger the bore the easier it is to get compression, Also gaskets almost dead match to cylinders. Standard ones are about 35 to 45 thou bigger than bore. Ordered pistons for thicker gasket than have to run.Just allowed for more closely fitted. Plus can drop couple points if like for 200 bucks or less. Figuring to run 14,5 to 15 since the higher you got the returns drop considerable amount. America home of free. Brought to you by 2nd amendment. | |||
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| DRR Top Comp |
That is part of reasons tuning window is smaller. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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| DRR Elite |
IMO anything less than 13.5 on na alky is pointless. Now it will run well still at 9:1. But leaving a lot of power on the table. Even at 13:1 my combo still liked the cam in where the cranking pressure was the highest. I like 14 to 14.5 myself…if you are planning to stick a decent duration cam in it Foxtrot Juliet Bravo | |||
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DRR Pro |
I requested my new pistons to be done so I'd end up with a final compression ratio of 16.5:1, same as my last build. Not sure what happened, but it ended up at 17.72:1. Oh well, I'm on alky, won't be an issue....and it's not. Tuning window is still very large, engine is making stupid power, just need to get the converter right. And yes, I'll be spraying it next season too.....I guess I'm doing it all wrong but it's working.....well.....so I'll leave it.... Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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| DRR Top Comp |
Hey if its working for you keep at it. Not sure i would go that high. Hell I congradulate you on getting it that high. Never have hyad engine go past 16 and thyat took work to get. America home of free. Brought to you by 2nd amendment. | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi compression,alky and tuning woindow
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