calling 3SGE Experts...

[Celica RA45]

fwd red top and grey top single vvti motors are 11to 1 comp same as the auto altezza 3sge same valve sizes and cams make 200 hp etc only the manual altezza has more comp bigger buckets or lifters and bigger and lighter valves titatium for both
and the cylinder heads are all rwd but the head gaskets are different for the fwd agianst the rear wheel drives and the water outlets just bolt on in different places
in other words you can change the altezza from rear drive into a fwd buy changing water outlets and head gaskets

[Titties]

Sorry to Hijack the thread, but does anyone have any pics of 1jzgte/ge or 2jzgte/ge pistons? they are all the same bore size but with different compression height etc.
I'm doing research for 5sfe crank into 3sge, and trying to work out if any other toyota pistons would work.

Cheers, Mike

[Truenotch]

Pretty interesting stuff here. I'm thinking about re-building my gen3 3SGE at the end of the year and need to gather info on the best way to do it.

My motor is a from an old NZ touring car corona. They had a compression restriction of 10:1 or so and it runs really small cams (257' in / 231' ex with about 10mm lift). I really want to bring the compression up and run bigger cams to make the quads and big extractors worth having. I was thinking of going up to 272' cams w/10mm lift but need to bring the compression up a notch.


So how do you figure out compression ratios? I know people use putty to work out how many CC the combustion chamber is, but what maths do you do from there to get compression ratio?

[Titties]

i thought you can pippete the Combustion chamber (head and/or piston) to find out the cc's of it.
Glenn said the altezza 3sge is 33cc, so i've been working off that.
once i pull apart my 2nd hand motor i got, i can work out deck height etc and go from there.

with the 5sfe crank, i'll get 2.5mm higher piston travel. if i can get something with a lower compression height (maybe 2jz or 1jz piston), that will cancel out the 2.5mm or close to it. shave down the piston to suit my exact compression i want etc

[Truenotch]

Ok cool, will work of 33cc and try to get as close to that as possible.

[fivebob]

So how do you figure out compression ratios? I know people use putty to work out how many CC the combustion chamber is, but what maths do you do from there to get compression ratio?

CR = (Swept volume+Combustion Chamber Volume)/Combustion Chamber Volume.
i.e. on a 3s-ge with a 50cc combustion chamber
(500+50)/50 = 550/50 = 11 i.e. 11:1 CR, well not exactly because the swepth volume is actually 499.6cc but near enough for this purpose.

[fivebob]

Ok cool, will work of 33cc and try to get as close to that as possible.

BEAMS engines have a lot smaller combustion chamber than a Gen III. Even so a 33cc combustion chamber isn't correct as that would give a CR of 16.2:1

[Titties]

Ok cool, will work of 33cc and try to get as close to that as possible.

BEAMS engines have a lot smaller combustion chamber than a Gen III. Even so a 33cc combustion chamber isn't correct as that would give a CR of 16.2:1

that depends on the deck height and the piston negative CC.
He has a yamaha (altezza i'm assuming) head on the gen 3 motor.

[fivebob]

Ok cool, will work of 33cc and try to get as close to that as possible.

BEAMS engines have a lot smaller combustion chamber than a Gen III. Even so a 33cc combustion chamber isn't correct as that would give a CR of 16.2:1

that depends on the deck height and the piston negative CC..

But you stated;

i thought you can pippete the Combustion chamber (head and/or piston) to find out the cc's of it.
Glenn said the altezza 3sge is 33cc,

So deck height and piston CC are already accounted for, or am I misreading it

He has a yamaha (altezza i'm assuming) head on the gen 3 motor

All 3S-GE heads are designed by Yamaha, the Gen III head is totally different to the BEAMS(Altezza etc).

[Titties]

sorry i probably wasn't clear.
3sge altezza Head is 33cc.

and now i think i've confused myself.
i was using http://www.csgnetwork.com/compcalc.html but thats combustion chamber, not only head cc.

lol back to the drawing board.

[®usty]

nice pic's of the pistons
Gen 3 3S-GE (non VVti) is 10.3:1 (but I think we all know that now)

He has a yamaha (altezza i'm assuming) head on the gen 3 motor.

for VVTi to work you'd have to have a vvti block, since there is a oil line to operate vvti

I'll try find a link to this 3sge 3gen info, has all the specs

[strx7]

3rd gen 3sge head has something like 48.3cc combustion chamber volume.
with 5s crank in 3s block, with 2JZGTE pistons shaved flat they sit i'd say 2-3mm below the deck, giving me 9:1 compression with a 1.1mm head gasket. If you shaved them only a fraction so the crowns sat flush with the block deck, and used a 3sge gasket instead of a 3sgte gasket, which i'm pretty sure will be 0.3mm thick you'd end up with some higher compression.

If you have a look here
viewtopic.php?t=72787
there is some pics of #JZGE pistons