I am thinking of rebuilding my engine and have come acrossed a question. Dish top pistons or Flat tops? If anyone knows the pros and cons of either, please let me know. Thanks
Its all about compression. What do you want to run?
The flat tops will give higher compression, but the dished pistons are better for flame propigation in the combustion chamber. A 2200 with the
stock design pistons, a zero decked block, a .036" thick Cometic head gasket and the head surfaced about .015" will net approximately a 10:1 compressio ratio. This will give you a better flame front and the appropriate quench to make more power than a flat top piston on a stock set-up motor.
Dome pistons rules!!!!!
Gilles
2.3 Ho
i read some where that flat top pistons are better to use where combustion pressure is high (i.e turbo, or supercharger) because they are less prone to hot spots and detonation?
Ok I will
Thank you so much again Karo. Also, the rods look so nice with the pistons.
Also, you can only go to a certain point with flat top. For more ompression you have to go with a dome.(like I did).
Gilles
2.3 Ho
For those that are wndering, Karo order them for me from Wiseco. The are for a 2.3 with a .030 overbore with compression of 12:1, yes you read it right, 12:1.
Gilles
2.3 Ho
Those......pistons......rule, not ifs ands or buts about it, that is tight. What compression will they yield on your 2.3? Are you going for like 11:1 or what?
so iam rebuilding mine for high compression its a 2.4l ld9 what would be a good compression ???
and what do you all have to do to run high compression iam getting it bored and getting a ported head and higher lift cams. and how much do i bore it ??
About 10.5:1 is about the safe max for compression on pump gas(93+ octane).
Only bore it as much as needed to remove any scoring and/or wear. As for what to do, a set of forged rods, the best rings you can afford and get it balanced. This is just a start, if your not sure what to do seek advice from a reputable machine shop, that specializes in high performance/ racing engines.
As for Mfk-223, I doubt he's running pump gas in that motor, not at that high of a CR. More than likely he'll be running some sort of lead free racing gas. I'd like to see how that baby will run though!
Edited 1 time(s). Last edited Sunday, July 02, 2006 4:10 PM
10.5:1 is probably the most you would want to go with 87 octane, you can run 12:1 on 93 octane if you build it right, several cars out now run that stock.
The 2.3 as been proven to be able to run 11.5:1 with 91-93 octane.
I'll be running 12:1 with bigger cams (they have more overlap, lift and duration) and alky.
The engine should be together by the 5th. I gotta get my Eagle rods honed a bit for the wrist pin.
Gilles
2.3 Ho
Sry Mfk, didnt see the post right before mine, I was replying as you were answering my question!!
NICE thats all i gotta say.
Im going to run boosted, supercharged on an LN2, this means rods and pistons on the next rebuild. So for boost, someone told me flattops are good, at 9:1 to keep the detonation down.
Any ideas with my situation. BTW im using an m90, on a 95 LN2, something that i havnt seen attempted yet. I've been told it can be done, with some crank/rod/piston work as well as a p&p for some extra horses and perhaps a valve job with stronger springs.
Fst cavy - no problem.
For boost I'd go with a dish as mush as you can. Anyway, you'll have a dish unless you use a head gasket .100" thick.
Gilles
2.3 Ho
