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ThinAir |
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#1
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Best friends ![]() ![]() ![]() ![]() Group: Members Posts: 2,546 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region ![]() ![]() |
This started out as this topic: http://www.914world.com/bbs2/index.php?act=...=ST&f=2&t=28067
It seemed like a good idea to start a new thread with different subject. The 2.0L engine I'm building is using stock crank & rods with stock size (94mm) Euro flat top pistons. My understanding from other topics is that when you build such an engine you get slightly higher compression than stock because of the flat top piston, but you basically don't need to change anything else. When I put the first piston & cylinder in place I used the .007" barrel gasket that was included with the overhaul gasket set. I measured the distance from the top of the piston at TDC to the top of the cylinder at .022" I don't have the actualy head cc measurement, but the paperwork for getting my heads done says they were cut .005". I don't know for sure if that is just this time or if the final cut is .005 including any cuts done during previous rebuilds. Using the math formulas and various calculators mentioned in the previous topic, I figure that if I assemble the engine this way I'll end up with a compression ratio of about 1:8.2 or 1:8.4 This engine will use the stock D-jet FI. So my question is: is it ok to assemble the engine with what I have or is this compression too high? If it's too high, what should I be shooting for with Euro flat top pistons? If I need different barrel spacers to reduce the compression, it's fine with me, but I don't want to just pick some number out of a hat or build it this way without knowing that it's ok. |
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type47 |
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#2
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Viermeister ![]() ![]() ![]() ![]() Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region ![]() |
we are at a similar point:
http://www.914world.com/bbs2/index.php?act=...&hl=deck+height i bought a piece of thick plexiglas at home depot and a circle cutter for a drill press and cut my own plastic disk to cc the combustion chamber volume. luckily, i borrowed a burette from a chemistry teacher. i used auto trans fluid but someone mentioned using cooking vegetable oil. i didn't have much trouble with the process. i ordered cylinder spacers to obtain a deck height of .055" (about/recommended) |
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