CHEAP compression
02-14-2012, 12:50 AM
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CHEAP compression What would be the cheapest way to gain compression on my 98 ls1? Milling the heads, 5.3 heads? I am carbed on a gmpp intake and am running e85 so I am looking to gain some cheap compression, what is a good amount to mill off a ls1 head before it starts to affect performance?
02-14-2012, 04:11 AM
#3
300 to do seats on 8 valves? Not sure where you have been getting machine work done but I'd say its time to find a different shop.
A set of 5.3 heads can be had for under 100 bucks in most cases, and having ls1 intake valves installed shouldn't run you much more than another 100. For what it's worth, I had guides and seats put in all 16 on a set of ls1 heads about a year ago and it cost of 200. That included a mill.
A set of 5.3 heads can be had for under 100 bucks in most cases, and having ls1 intake valves installed shouldn't run you much more than another 100. For what it's worth, I had guides and seats put in all 16 on a set of ls1 heads about a year ago and it cost of 200. That included a mill.
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02-14-2012, 10:17 AM
#9
Id put my money into increasing cylinder head flow, not compression. Flow is much more important to increasing power potential of an engine, especially since your doing a head swap already.
Buy the BEST heads you can afford, if you cant afford good heads then save for however long it takes without doing any mods. Itll pay dividends in the end.....
Buy the BEST heads you can afford, if you cant afford good heads then save for however long it takes without doing any mods. Itll pay dividends in the end.....
02-14-2012, 07:25 PM
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Id put my money into increasing cylinder head flow, not compression. Flow is much more important to increasing power potential of an engine, especially since your doing a head swap already.
Buy the BEST heads you can afford, if you cant afford good heads then save for however long it takes without doing any mods. Itll pay dividends in the end.....
Buy the BEST heads you can afford, if you cant afford good heads then save for however long it takes without doing any mods. Itll pay dividends in the end.....
02-14-2012, 08:47 PM
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No but I know running gasolene if You went from 8 to 11/1 and You have 300 HP at 8/1 ,,,,,You only gain maybe 30 hp so how much can You gain with e85 ,,,,,,,,maybe 60 hp ,,,,,,,,,,,,,,with a set of 300 or $400 243's and a cam You can gain over 100HP and with bolt-ons another 30-50hp actually more than that . You can go from say 350 flywheel HP to 450 to the wheels which is close to 175 flywheel HP gain . And if You raise You're compression really high now ,,,,,You're stuck with that compression unless You buy more heads or go with thicker gaskets and screw You're quench ,,,,,,anyway good luck
02-15-2012, 07:05 AM
#14
Power gains from compression increase is typically about 3% per full point. So even a full point compression bump on a 500hp engine would only be 15hp.
Your looking to go up less than a point and probably not on a 500hp engine. I still think you should save your money for good heads, with the chamber size you want as well.
Your looking to go up less than a point and probably not on a 500hp engine. I still think you should save your money for good heads, with the chamber size you want as well.
