Crank me up!
Turbo Mini Forums

Building up 1380 fast road jobbie (no forced induction on this one though) and was wondering who does the bestest crank!

I want it to be light with all the gizmos, but Im not stretching to a billet steel one............

MED seem to do the best priced one @360 for x-drilled, wedged, bladed, back drilled and nitrided or whatever it is.

Any advances on that?!?!?!?

Don't blade it. Apart from that, go ahead!

What happens if you blade them then???

It countereffects the reason for wedging. You NEED material in the opposite end of the big end journals Main bearings die earlier.

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Its not going to do anymore than 3k a year, but its got to rev like buggary and if i can make it rev quicker then thats the route i want to take........

surely if its all balanced and harmonically damped its all good stuff???

im on a std crank

tbh your limit on revs wont be the crank it wil be the cylinder head and Cam If you go for the full monte crank be aware the engine life of a full blowen race engine can be as little as 20 hours that would be a little less than 3K miles most race A series rev to around 7500 rpm,
I run a 1380 N/A motor in my rig it is an every day mini it uses the SW5 cam and has a MED x-drilled, wedged, , back drilled and nitrided and balanced crank one of my own Cylinder heads with 36.5mm inlets and off set 32mm exhaust It makes 105HP at the flywheel and pulls like a train from 1500 RPM to 6000RPM
I build full race N/A engines which run 310 cams full works cranks very nice heads they are also 1380 the difference is they have no power below 2000 rpm
they rev to 8400RPM the make 130 hp +/- 5 and last about 22 hours.
Its all a balancing act,
Have fun, then Turbo it.
regards,
Paul.

EDIT: becaus im a donkey

Edited by PaulH on 17th Jul, 2008.

carl, what happened to that crank you drilled holes in? is it still alive?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

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I wondered about vizards old comment about getting one cut with bigger mains so that it was stiffer and line boring the whole block. There are cheapish cranks being cut in china and EN40 is EN40 and as long as it's accurate.......eh?

I wondered about how feasible I could do my own crank. I don't have access to a milling machine but I think you could achieve very good results with an angle/die grinder, some very careful measurements, weighing, some prussian blue and a pattern. When I get the shed up and running, I'm going to have a go. Get the thing finally balanced professionally........

I was chatting to a guy who made minisprints in the 60's and he said about how they lightened everything to a ridiculous degree. Including cutting bits off pistons/etc....

I know the approach is precision engineering is the way to go. The thing is that the old boys had some good ideas

Bugger off, I'm getting there.

trouble is some of the "old boys" are full of shit.

take my old man for example, his tall tales just keep getting taller.

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Paul H, Im not going to be gunning the nuts off it all the time so i would hope it would last more than 20 hours!

I did forget to mention that I have a 7 port head for it as well, 37.7x31 in the valve department and 40DHLAs as the fuelling. Hoping for about 120-130 at the fly, but Im more interested in the amount of torque I can get.

I did see someone had turbo'd one of these on here............seriously tempted I have to say!!!!

Hi,
There's a turbo'd 7 port and a turbo'd 1380, but not on the same engine.
If you want torque, turbo is the way to go!
Cheers,
Gavin :)

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Joe (mini13)'s 7 port turbo is 1380cc.

In the 13's at last!.. Just