kade pistons swap
#17
I think it is about 12mm of clearance using 90 pistons, or so I have been told. I haven't actually measured it myself. I think with the 89 pistons you get a little under 8mm clearance, but don't quote me on that I haven't measured it out myself
Any cam combo can work it's all about tuning your engine management. Placement of cams is a big thing too, especially for overlap, and how agressive your timing would be..
If people do chose to use stocker 248/248 cams, and can't achieve any more lift in cams with the 89 pistons, you could always get larger valves up to .040.
Last edited by BigVinnie; 05-12-2008 at 08:24 AM.
#19
8mm, from the valve closed to the piston or what? Cause isn't stock lift on the S13 cams like 9.3mm~?
Also wouldn't OS valves give you even less clearance because now that the valve is bigger it's edge is closer to the piston? Correct me if I'm wrong
Also wouldn't OS valves give you even less clearance because now that the valve is bigger it's edge is closer to the piston? Correct me if I'm wrong
#21
If you enlarge the valve that would leave less clearnce so even using 90 pistons if you were to enlarge the valves .040 you would be stuck using 240 cams. Or if you use 90 pistons with no valve enlarge ment you could get away using 270 duration cams. Or at least that is that I have been told.
You also have to consider where the valve opens in stroke 1, and where it opens in stroke 4. You are dealing with more play, but then you have to worry about valve overlap at higher rpms.
I wouldn't quote me on this though I should be checking this as fact not here say.
Last edited by BigVinnie; 05-30-2008 at 11:57 PM.
#23
Yes and no.
It will work with the cams not with the oversized valves. It could bend a valve at high revs.
You would probably have to step up to titanium retainers and springs, get to much valve float it could bend a valve.
It will work with the cams not with the oversized valves. It could bend a valve at high revs.
You would probably have to step up to titanium retainers and springs, get to much valve float it could bend a valve.
#24
So 90 SOHC Pistons and BC 264's would work w/ stock Valve Size? Would a full Supertech head be enough to prevent valve float and bent valves at 8k? Lighter Valves and Retainers and Stiffer springs, that should be more then enough eh? Then a good P & P to top that off.
#25
thats what im thinking jus with bc head wit p&p head i have should do wonders with a good tune..if not i'll suck it up n put in je 11.0.1 pistons wit vavle reliefs.. !!speakin of reliefs could you take those 90 pistons n get vavle reliefs put into them???
#27
It would weaken the piston strength.
Last edited by BigVinnie; 06-03-2008 at 07:10 AM. Reason: Merge posts together