17 replies to this topic

[Leonard]

ive just got a turbo engine from a mate, but it needs rebuilding. i got the whole engine, and all manifolds, carb dizzy, turbo etc for the bargain price of £60.
trouble is, the end of the crank, on the taper where the flywheel fits is a fairly chewed up. can this be built up and reground?

[Ollie180]

woo nice one not bad

ne chance he got anymore :erm:

[Madmax]

i dont think so leonard, i believe a new crank is in order, any pics? if it is repairable though i would still get a new crank, its not worth doing a half-arsed job

[Purple Tom]

The crank will be beyond repair if the taper is damaged. For every thou removed from the taper I believe it moves the flywheel about 4thou closer to the engine. Not good. (don't quote me on those figures, but I know the flywheel moves closer to the engine very quickly)

The best thing to do is spend the money you've saved on a new crank

[Wil_h]

Yep, there was nothing special about the turbo crank that makes it worth saving.

Just get another one.

Wil

[Leonard]

i thought it might be hard to grind a taper. a new crank would be worthwhile i think, thanks for the replies

[Sprocket]

Keep your eye on ebay, new cranks sell for around £150 which is dam cheap :cheese:

[Turbo Phil]

Just try and find a standard low mileage 1275 engine form a Metro and use the crank form that. Get down to the scrappy ! lol

Phil.

[gutted]

I thought the proper turbo crank was ntirided to make it stronger?

But, in fact, it's cool to use a normal 1275 crank? That's pretty sweet - I've been keeping my eyes open for a genuine turbo crank on eBay for ages, as a spare. But if a standard 1275 is good to go, then I can relax :grin:

[Turbo Phil]

If you're lucky you'll find a 6581 crank, this is the proper Turbo crank and they do seem to be a lot harder wearing than the standard A+ 6232 items, though somewhat rarer.
Nitriding a crank will not make it stronger, it just gives it a better surface hardness so they last longer before regrinding is needed.
At the end of the day it's revs which kill a crank, and on most Turbo motors you'll find than max power is made below 6,500 in which case using a standard crank isn't really an issue.

Phil. :grin:

[Sprocket]

MiniSport selling off the CAM6232 cranks with bearings for £150, though bearings will be the standard ones.

http://www.minisport...ft-product.html

The thing with a new crank is that you know that it has not been abused and will have standard bearing sizes all round. A reground item could set you back this much outright

[Sprocket]

Deleted. Ignore this post

Was wrong item :nugget:

[Leonard]

minispeed are doing ni-tempered reground cranks for £85. i'll go for one of them. I'm gonna fit the mirage T2 kit, as the T3 ive got has a lot of slack in the bearings, and is a bit of a monster for a 1.3litre engine. anyone got a second hand kit? also, how well would an sw5 cam work in a turbo, as im after plenty of torque

[Leonard]

ive just split the engine from the box, and the crank is a 6581. its a shame its knackered. the pistons dont have much slap in the bores, so ill just put new rings on, as the standard pistons are supposed to be good. if the compression ratio is lowered by opening the combustion chambers in the head, will the standard pistons be ok for more boost?

[wolfie]

i have a good 1275 crank you can have for a tenner im only down the road as well