mobythevan Posted March 10, 2005 Share Posted March 10, 2005 What happens in a boosted application if the first piston is used? What will the chamfers on the edge cause to happen? The second piston is the standard TRW "blower" piston with the D shaped cup. The first is just a regular forged TRW piston, but both yield the same compression ratio for all practical purposes. The guy at summit is telling me I can use the L2377F, but I am a little worried about it. I know the L2453F is built for boosted engines. What are your thoughts on this? I am just curious before I put in the order. I think I am going to stick with the standard blower piston unless you guys tell me the chamfer set up will not cause any issues with the top ring. Quote Link to comment Share on other sites More sharing options...
Zhadman Posted March 10, 2005 Share Posted March 10, 2005 Aren't the recesses on the 1st set of pistons included for valve clearance? Quote Link to comment Share on other sites More sharing options...
Guest JAMIE T Posted March 10, 2005 Share Posted March 10, 2005 I believe the chamfers he's talking about is on the outer diameter. I'd use the Blower piston personally. They come with floating pins if memory serves me correctly. If you are using aftermarket rods(and I would) then you'll be set. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted March 10, 2005 Author Share Posted March 10, 2005 Yeah, that chamfer around the outside above the top ring is what I am curious about. I believe I will stick with the blower piston like you say. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted March 10, 2005 Share Posted March 10, 2005 Wouldn't you want to keep the A/F mixture coming into the engine closer to the flame front? With the first set of pistons, you'll be sending all the mixture to the outside, closer to the ring lands, away from the flame front. Since the ringland is what's weakest on the pistons, I would choose the second set to keep the A/F in the center close to the flame front. Closer to the flame front, less timing you need to make power also. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted March 10, 2005 Author Share Posted March 10, 2005 That is what I was thinking, but this summit guy insisted they would be fine for supercharged setup. So much for listening to him. I thought maybe he knew something I didn't. Quote Link to comment Share on other sites More sharing options...
getZ Posted March 11, 2005 Share Posted March 11, 2005 The first set of pistons look very strange. I don't know why you would ever chamfer the outside edge of the piston. You would create pockets on the outside that keep a good even burn throughout the chamber. It looks like some kind of attempt to raise the compression. Flat tops or the dished ones would work better. Quote Link to comment Share on other sites More sharing options...
Tony D Posted March 17, 2005 Share Posted March 17, 2005 blower, supercharger, turbo... Both a blower and a turbo are superchargers... They are all forced induction engines. A turbo will use a different piston than a blower. I would go with the second piston with the first ring pulled away from the combustion chamber, and a dish to concentrate the fuel air mix at ignition into a central turbulent area. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted March 17, 2005 Author Share Posted March 17, 2005 I got the second pistons in and they are at the machine shop now. Should have everything back next week and I'll start assembling the monster. I really like the thickness of the top when i saw the pistons first hand. Very rugged piston. Maybe my L28et will blow up and this is the only other running engine I will have around for a while, yeah right, like I would try lowering this thing in. Quote Link to comment Share on other sites More sharing options...
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