n/a 4e crank same as turbo crank ? if not what can a n/a crank take

[mikey4410]

As above guys.

What do you think an n/a crank can take comfortably and is a turbo crank much stronger?

[Phil]

4efte crank has bigger counter weights.

not the same.

as for power, i dont know what it could take though id imagine any crap tune over 200hp will give it issues.

Phil

[mikey4410]

Counter weights bigger? Whats that achieve do you reckon?

[AdamB]

Depends what kinda build your doing, if its a stock build the crank would be the last of my worries. If its a forged motor then providing its static and dynamically balanced I see no reason why it can't take as much as a turbo crank.

[mikey4410]

Why would u get the crank balanced because going forged.read sonewere that toyotas cranks are seriously hard to improve on balance wise.

[AdamB]

Lol back to that old chessnut. That's purely the engine builder/owners decision, but balancing the rotating assembly is one of the very few procedures I would personally take in building a motor.

The list of machine work to carry out on an engine is quite defined and in all honesty I've not seen many people carry out half the things when building a proper blueprinted motor.

List of things I would advise when building a motor:

Crack test the block and head

Line bore the main bearings

Bore the cylinders

Check cylinder wall thickness

Ensure cylinders are 90 degrees to crank centreline

Crack test the crankshaft

Check crankshaft straightness

Crack test rods, if using stock items and shot peen

Balance rotating assembly

Thats all before you even get to check what size bearings you need or check oil clearances.

Edited December 7, 2013 by AdamB

[mikey4410]

Oh okies.i get you mate.cheers for input.

[AdamB]

Edited post mate.

Cranks tend to last quite a while if the pistons and rods are lighter, along with not going too mental on the rpm limits, but most peoples turbos will run out of puff before the crank rpm becomes an issue.

I'm sure RobH is still using the N/A crank and hes over 300bhp I think.

Edited December 7, 2013 by AdamB

[Rob H@RCH Engineering]

As Adam says I am running a N\A crank in mine @ 230whp on forged internals works good for me but I'm only running quite a tame rev limit too.

[Chief Quimby]

Anybody have Picture of them both, they have the same part number

[AdamB]

I thought they were different, the 4EFE crank is marked 4E, where as the turbo crank is marked 4ET.

[maddox710]

Whats about seels each end sorry for hijack

[Rob H@RCH Engineering]

The early N/A uses the 4ET crank and the later ones use the 4E crank mine is the 4E crank. The early ones are the same as the turbo cranks but the later 4efe used a different crank. going on this theres only the 1982 GT that has a different crank!

1999 glanza 13401‑11061

1982 GT 13401‑11060

1999 N/A 13401‑11061

1996 N/A 13401‑11061

[mikey4410]

Rob h u have nailed it.thanks so much for all inputs.