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Cruisin's RX-8 L67 Swap



Cruisin38 said:
I'm not sure how you mean, Any pics or links? The F-body manifolds both work perfect is it's lower, it moves the coolant thermostat housing forward and makes turbo plumbing easy


One of my main goals was to stay away from a V8. I originally considered 4cyl engines like Nissan's SR20DET. Eventually V6's starting popping up.


Ha, Me Too!!!



Was looking at the F-Body manifolds. Everything looks good, I'll likely need the LIM, Upper/plenum. Fuel rail and MAYBE the throttle body...
Can anyone confirm if the F-body's have the same throttle body as the GTP's?
Then I gotta close up the injector holes in the heads.
Click to expand...

Some of the fbodies used drive by wire throttle bodies iirc. But the cable ones were the same as the l36 tb irrc.
 
Slick2500 said:
Some of the fbodies used drive by wire throttle bodies iirc. But the cable ones were the same as the l36 tb irrc.
Click to expand...

Ah good. My only real concern is rather the flange is the same and if i'll run into any issues with the coolant passages if they happened to changed them. If anything I can just weld em shut ha
 
Cruisin38 said:
Ah good. My only real concern is rather the flange is the same and if i'll run into any issues with the coolant passages if they happened to changed them. If anything I can just weld em shut ha
Click to expand...

the lim fits just fine. 3800's are all the same really. the blocks are all identical. like a n/a block has the threaded holes for the super charger pulleys and all.
 


You could have always modded the firewall and ran a 180* U shaped intake pipe off the blower inlet and ran the TB next to the blower case itself.

Turbo is worlds better though.

As for the motor...been there done that. If you don't have a machine shop take care of the work on the mains, you'll be lucky to get 100 miles out of it. I say while its out, do it right. Not that much work since its on a stand...and you can stud it. Which will be better in the long run regardless.

Cool swap though. I always liked the track capabilities of the RX-8.
 
Can anyone provide more info about the motors not lasting after a bearing swap?
I mean, you bolt the mains down to have it line bored, wouldn't removing the mains to install the internals make it "twist" again causing it to knock? What am I missing?
Multiple people have told me on here to expect knocking, but I can't seem to find much info on this phenomenon...

I'm not trying to argue with anyone. I'm just looking for more details.
 
theres a bunch of threads where guys did the rebuild and they blew up asap.

if you get it align honed it will be ok. like stated, the block will twist when you take the crank out.

and then you may as well get the crank cut. cause your there already.
 
Well I guess I'll keep looking.
To be clear I didn't pull the crank, just the rod and main caps.

I'll do more research and see what I come up with.
Thanks for the info!
 


Ha! Well I can assure you it'll get plenty of abuse. We'll see how this one ends up.

Guess that can explain why GM added the side main bolts that go through the sides of the block in series 2...
 
Are you going to ever run it on SC or go straight to turbo?

Funny people mentioned the block twisting. My factory l67 ate the front main journal and killed the oil pump. I replaced the crank with a 10-10 ground one because it was a little scored. Replaced the mains and rods with no line boring. Ive got probably 15K+ on this engine and no problems.

News to me!

This thread is more proof GM makes the best rebuild kits for blown rotaries! :)
 
Gutless said:
Are you going to ever run it on SC or go straight to turbo?

Funny people mentioned the block twisting. My factory l67 ate the front main journal and killed the oil pump. I replaced the crank with a 10-10 ground one because it was a little scored. Replaced the mains and rods with no line boring. Ive got probably 15K+ on this engine and no problems.

News to me!

This thread is more proof GM makes the best rebuild kits for blown rotaries! :)
Click to expand...

I did originally want to run it supercharged first, then go turbo once the rest of the car is done.
But as my buddy and I figured, I'd spend the time and money to modify it, only to undo it and throw that money in the trash to then turbo it, Since being turbo'd was the ultimate goal in the long run.
He found a T4 turbo he had, so I'm going to use that, then swap to a bigger turbo down the road most likely,
assuming it doesn't knock ha.

I have read about the front end of the crank not getting oiled very adequately, hopefully I won't run into issues.
Some people may have had issues, some may have not.
My plan is to run it as I have it and see what happens. If it knocks, then oh well new engine time, if not then awesome! time to run it hard! haha


and yea good point. More GM engines are ending up in these RX-8s hahaha
 


Then you should move to the middle of Nebraska or Utah or something...
heh Antioch. I spend quite a lot of time around there.
 
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