crankshaft weights
Turbo Mini Forums

having crafted many a modified A series crank over the years, i have only just got around to weighing one, now obiously i know the answer but does anyone know from experience or would just like to have a guess how much weight is removed by, + or - a few oz's
wedging,
knifedging,
lightly backdrilled,
and a good clean up [very generous radii all round]


for scientific evaluation only of course.

carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

i recon about 1lb

always looking for them bigger bunches of bannanas

1.2lbs at best.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

mmm, i'll go for an over the top guess at 8.2lb

2Kg / 41/2lbs

I seriously doubt it!

4.5kgs

3 and 1/2lbs .
not as much as i thought it would have been ,and woulkd have been even less if i'd not turned the outer most sections of the counter balance and little ends down .
carl,

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

When I saw this thread I weighed a standard crank at 10.25Kg and my race crank at 8.25Kg. thats quite a difference.
I suppose there is quite a difference between crank weights from the factory.
Paul

I seriously doubt it!

10.25. EHHH, thats 22 & 1/2lbs

the standard one i weighed was 25 & 1/2 lbs, albeit with fishing scales, i think i need to get hold of some better ones,


carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

I was going on the fact that the Morspeed website states that wedging removes 3kg:
http://www.morspeed.co.uk/machining_mini_page.htm

LOL Me too.

so according to morespeed a wedge and knifedge will remove 4kgs, or nearly 9 lbs, or in other words over a 1/3rd of the weight of a standard crank,
NEVER,unless you go for 1" mains and 3/4" big ends, and then wedge down to these,sizes.lol.

got to be fantasy quotes. unless hes talking about imperial weights.which may make more sence


carl.

Edited by fastcarl on 31st Jan, 2007.

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The chaps not doing bad if he's removing 35% off the std crank... i like to have a good look at one of those..

I cc'd one of his 29cc turbo heads the other day and it came out at 26cc so i guess numbers sell parts.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

HA HA,!!!! sorry.

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

Was the wrong one ordered - or is it stamped up wrong?

Nope the right one ordered, stamped and sold as 29cc.. The poor guy had been running it for a year without knowing..

Would be nice to get what you pay for sometimes.

Wonder if MED heads measure under their stamped CC.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

well the head should be what its sold as but....

always check!!

thats good ive just sent mine off to be chambered to 28 cc, best i bloody check that when it gets back.

always looking for them bigger bunches of bannanas

If scholar are chambering it mate it will be 28cc.

-MINI CLUBMAN 1380 TURBO-

simon mate not scholars.

always looking for them bigger bunches of bannanas

maybe they stamped the 6 the wrong way up in 26 doomeister?

I don't think so... But you can think that if it helps you sleep at night.

When you think about it how many people have the facility to check other peoples work.. So you trust them and take what they sell you but that dosn't mean it's what you asked for...

It's a damb site easier to make a 26cc head than a 29cc one.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

I just measured my bowl head last night, and it was 31cc. A LOT of material has been removed. So, getting a 29cc head done with decent chambers must be a nightmare.

35 cc is quite possible and it still resembles the weslake chamber shape. But the chamber is DEEP.

Yes. You'll need shims under the pedestals, and the short turn radius in the valve throat would be even worse than standard. I guess it's better to get some dished pistons if going to these extremes. Especially now as this kind of pistons are readily available. Valve shrouding would be bigger as well. Agree Jukka?
I know you've made some gigantic chambers, but any downsides?

Edited by Vegard on 2nd Feb, 2007.