Forged Steel Xr6t Cranks

[bcl]

Definitely don't stroke it.

My motor is fully sleeved. I would not overbore it is I would not want to weaken the motor further.

In R&D I've split the bore on an engine.

If anything you want to destroke it and then run high revs for big power, if that's what you want.

This was covered in threads a few years ago.

Brian

[HIPWRED]

if you did that maybe you could get them close to squre but would that method hold up to big ponys

All alloy blocks are sleeved... and even things like topfuellers run sleeves. Sleeves are generally stronger than cast bores. There is more uniform thickness.

For example my block is over 6mm thick on each of the thrust sides (where it matters) but maybe only 4mm thick on the other sides. You can get 300 thou (7.5ish mm) thick (all round) sleeves.

Was going to sleeve my block but cos it has been unused since factory and has plenty of meat.

Unfortunately the guys say cos of the position of the water pump, we cant grout the block, which is always a good insurance policy.

Leigh

[Guest]

So you're using a new block for your build? I thought it was better to use a seasoned block to avoid any distortion/shifting/warping etc once big power & torque is pushed through it??

[HIPWRED]

Just about everything to do with the block is being changed... so its not gonna make much difference. I'm still in 2 minds about the sleeving even though Jack Bros (whom are very reputable) reckon it will be fine. Same reason as the steel crank - which all this sleeving/boring convo is hijacking - good insurance. I dont want to have to touch the thing once its built - cept for standard servicing etc of course.

I've emailed Crankshaft Rebuilders about the crank. I dunno why I didnt think of them in the first place.

Leigh

[01txr]

Try a place on tradelink rd browns plains, think its called crankshaft engineering.

Last I heard was a guy by the Name of Craig Brown was owner or co owner.

This guy use to own a street VW beetle that ran 11.7 N/A back in the late 80's to early 90's,

held the ssc class record for 2-3 years.

He is suppose to know his trade well s I have heard other resources recommend him.

he use to work for a VW Workshop that I ended up working at after he left. use to go in and

bug them all the time before he left and I started there.

[HIPWRED]

Hi,

Yeah that's who I am getting to modify the standard crank if I go that way. I dont think he can MAKE me a steel crank though. But, might ask.

Leigh

[lukedohc]

thanks for this info cause I picked a old ba n/a with 290000k on it with loss commprission in number one for $250 and got it ultrasounded and I came up with the same thicknesses as excactly not bad for a taxi engine hehehe

[HIPWRED]

Yeah taxi engines get surprisingly low wear cos they are almost always at operating temps and are usually regularly maintained. Its cold startups that cause most wear to an engine

[lukedohc]

yeah I thought my engine guy was telling febs when he said that mine is better that some brand new blocks he has tested

[Typhoon]

I can 100% confirm that at least 2 stock crank's have faild at over 500 FWKW's.

I would rather not go into the details but I can 100% confirm this.