Is the 4G64 crank strong enough for a high HP application?

 

I bet you might be pretty happy with a BB converted turbo. On Lancerregister.com those guys seem to be getting peak torque WAY low. The only problem I see with that is your gas mileage will probably go to hell...

 

Zeus, I am seriously thinking about a BB turbo. Although the natural torque from a larger engine would be desirable too, especially with a BB turbo.

Am I asking for too much?!?!!?

I know www.jacksonautomachine.com makes 2.3 or 2.4 kits for mitsu's@ a reasonable price with very good component options, but the lady (owner!) there was a bit skeptical about the evo engine vs. other 4G63 engines. She mentioned something about crank-walk & only using an upper or lower thrust bearing in an evo 8 engine? I dont know different, so I cant comment about our evo thrust washer concern / issue. Maybe David buschur can shed some light.

I do know we reliably ran thrust bearings; 1/2 only, on engines that spun well over 16k for 500 mile races without issue. Hell, we continued using these thrust washers for thousands of miles. So I dont know what the big deal is on a properly balanced engine spining 8K max? Maybe its due to repeated clutch use in a street application?

 

haha, zeus, thanks for the ad!

 

haha, discussing gas mileage and stroker engines in the same thread....damn the gas mileage, FULL SPEED AHEAD!!!

 

Hey, I average 17mpg now on a car I put 25k a year on... it is a consideration on my daily driver...

No sweat on the "advertising" I'll hit you up for a "deal" sooner or later. My funds are just too tied up right now.

 

To my knowledge, "Crank-walk" was mainly limited to DSMs. I've not heard of the problem with the different generations of the Evo.

 

You forgot AMS Focker! Still rippin **** up in PSL huh? Bring your *** to Chicago sometime so we can go terrorize the streets like back in the day!

 

Domestication of products. Calling in JUN for a stroker kit for 5 grand is assinine. I've seen guys use Eagle rods, Ross pistons and a stock polished, knife edged crank (stock). Should be plenty for well over 450 whp with arp head studs.

 

The original reason behind the JUN stroker kit was because some of the middle Evo's (5-6) had a problem snapping cranks in half at 400hp. So they set to work making their own crank, they figure since they were going to the trouble of that, to go ahead and make it a stroker.

 

Good point, but I still wouldn't pay that kind of money, especially for 95% the people who don't need that kind of power.

 

i am a bit sceptical. 2K for a stroker seams a little cheap to me. i know you dont always get what tou pay for (i.e. HKS stuff) but that does seem rather cheap. i recon that egale are using the 4G64 crack (sorry if this has already bin said) with their own rods and baybe pistons. now this is not a bad thing. the stock 4G64 crank has bin run to over 600bhp in the UK, and if they do upgrade the rods (the weak point on the 4G64 set up i think) then the engine should handle the above HP no problems.

moses here in the UK (thats the guy with the 600bhp) said he had a redline of around 7.5K on the 4G64 crank. although i have seen some on here say that the set up can run to 8k+. i think the lower figure is best adheared to with the stock crank as no one seems to know what the stock 4G64 crank will take!

also the RnR set up looks very good. they say their engine revs to 8K+ no probs which is very good concidering the size.

the problem with rpm on the strockers is that you they run very long stroke to bore ratio. this means there are huge forces on the rotating asembly compared to a more square set up. this is why (on other engines) people try to bore the engine out before they start to increase the stroke of the crank. this way you maintain high rpm and gain cc.

the JUN stroker is the dady! the thing will rev to 8.5K all day long and witstand 800bhp! look at norris designs car, it is fanominal. the jun also lets you run a smaller turbo (ie quicker spool up) and still make mega power. this would be my choice i think. but the cost is also very big!

thanks Chris.

PS. t the guy thats is putting down strockers.

Norris Desgin = 2.2 JUN = 800bhp (on a engine dyno)
RC Developments = 2.3 their own = 930bhp (approximate)

need we say more. but i will

Mach 2 racing RS200 EVO2+ =2.4 ltr BDT = 840bhp. yeah thats the RS200 that attended Pikes Peak last year!

 

Don't forget those hardcore BDT motors were based on totally different block and head as they were much longer with a hell of a lot more bore spacing between the cylinders.

 

yes but even the Ford RS 200 EVO was only a 2.0ltr i think. Muntune (i think) here in the UK build some and the EVO2+ are only 2.2 normaly! this 2.4 beast is huge.

still be nice to see the EVO with a bigger bore. also be cool if someone out there could cast a block and head up in aluminium. you could run larger bore and grater spacing in betwen the cylinders and run though bolts! Millington racing do a similar thing to the Cosworth engine over here. normaly a cossy is 2.0ltr but these guys build aluminium ones that have similar stroke but are 2.5/6ltr! and they can bulid 2.0 ltr engines that are aboslute scremers.

would be nice but i dont think it would happen. the cossy units cost around £13k and thats not the big ones either! still you can dream.

thanks Chris.

ps. maybe something will come from the WRC EVO!

 

Maybe if Evo production stays up, Dart will get involved someday like they did with the Honda blocks.