Detailed 2.4 4G63 stroker Info needed

[insanewayne]

Ok, so i've been dead set on doing a 2.4 using the 4gcs...but i'm on a budget to get it started...and the wicked deal i found sold on me...so i need some info on how to calcutale the amount of boring needed to put the 4gcs crank in the 4g63, and then bore the cylindes to make up the extra .1 L....also what is the formula for rod/stroke ratio, would it be better then the standard 2.3 stroker ratio of 1.5? or is piston size not a factor in the ratio.

I beleive the cylinder size must increase from the stock 85mm to 87mm... or so it says here.
http://www.pinktemple.com/stroker.html

But i don't know how to convert that to 0.xx" over ..but my calcutaions get .07874" over...

which is 2.376 L ??

These are all formulas i made up in my head...so i need somoene to post some good formulas for engine specs...or link...cuz it would be very useful for me at this descision point.

Ok I figured out the rod/stroke ratio formula....so 1.5 is all we can get out of it...i thought that cylinder diameter would play a factor...but no...so the most we could do is throw in a long rod option, (156mm rod) and get a 1.56 ratio...but really how bad is that? ...like i know 1.7 is ideal..and thats what our beloved 4G63 has....but im on a quest for torque and
fp3065 spoolage and 5-600 hp....so would i get decent cylinder filling at bdc and not too bad of cylinder wall wear with 1.56?

Ok so basically i need to know the details on this 2.4 4g63, who's done it, and maybe some more in-depth technical discussion.

Thanks guys

Wayne

 

[Audionuttt]

*But i don't know how to convert that to 0.xx" over ..but my calcutaions get .07874" over...

which is 2.376 L ??*

87mm / 2 = 43.5 * 43.5 = 1892.25 / Pi (~~ 3.14159) = ~ 602.3223908.... * 4 (# of cylinders) = ~~ 2.409..... cc or 2.4Liters.

See:

http://groups.yahoo.com/group/4g64/

for more info on various strokers / 2.4 conversions etc. Also:

http://www.wideopenwest.com/~ksmith3289/

(On that last link look under General DSM FAQ for 4g63 stroker)

 

[insanewayne]

Great, thanks alot man!

 

[BoostedTalonTS]

(Subscribing)

GOOD STUFF!

 

[MNGSX]

I'd just run a std overbore....

It will run cooler...

There is nothing you can do with the 100mm stroke to make the rod ratio better enough to be worth the cost...

Use a G63 block because stroker pistons are lighter and have a higher pin placement that reduces piston rock a bit.

IMHO keep it at or under 7K rpm unless it is an all out racing machine. Long stroke + revs+ daily driver =

I'm building on a 4gcs/G64 block for the opposite reason...

Deck height...

I'll run a 88mm stroke, 87mm bore pistons like those used on a G63 stroker for the pin relocation.. 1.130 compression height but with ALOT less dish.... Alky motor.... 6.4" or so rods Then running low tension rings and a 4 vane vaccum pump... As close to a dry sump as you can get with a std sump...

For comparison sake according to EAPro this setup has a friction HP (HP consumed by friction) of 14 Hp vs a std 2.4's friction HP of 29.29hp at 5000rpm. Piston speed, G-forces etc are alot different too...

For a street and strip engine 2.4's are ok... For allout racing... No...

 

[insanewayne]

Yeh, I would love to do a 2.1 up once I get some money, but i.... have a dream. ()

I want the 2.1 R/S ratio of 1.84, (162mm rods) but with more displacement. I havent had the time to dig up the formulas and work out how far I'd need to bore for 2.2, or 2.3, but I am quite curious.

Wayne

 

[na90dsm]

does anyone have the cc of the combustion chamber for the 4gcs head. im tryign to compare it to the 4g63 head cc on the cumbustion chamber. im trying to find out what the compression of the 4g63 head on a boen stock 4gcs or 4g63 bottom end would result as far as compression ratio.

tryign to find out what the stock compression 4gcs or 4g64 pistons will net when a 4g63 head is dropped on top. any info or links would be sweet. thanx

 

[insanewayne]

It's been tried out of boredom, from what I remember, it was like 6.2:1 or something, I'd double check those valve reliefs though.

 

[CanadianTalon]

Go look in the big G4CS/4G64 thread, everything you have asked has been covered.

I would personally run the G4CS block instead of a 4G63 stroker, you can keep the piston pin lower and out of the oil ring, which will help with longevity and oil consumption on a street motor.

 

[na90dsm]

and this thread would be where?