Crankshaft data base

[Fruecrue]

I was thinking that a data base of crank measurements (I know) would be useful.
When I decided to swap a Solo 681 crank into a Dolmar 7900, Randy and I measured and compared cranks (I know).

Could really open the door for some cool builds.

I’m not asking you to pull out your crank and measure it, simply measure it, if you’d like, next time you have it out (I know).

Here’s the original drawing I made for the Solo/ Dolmar swap and a blank that can be printed, reproduced, altered, etc.

 

[Fruecrue]

Remember that this would involve humans measuring things, so there is always a margin of error.

If you’d like to see any measurements added, let me know.

I understand that some may be different than the drawing, we can adapt.

 

[XP_Slinger]

Good idea Dave, nice of you to share your crank measurements (I know).

 

[srcarr52]

Accurate rod lengths would be nice too!

 

[huskihl]

How big is your air filter?

 

[AlfA01]

I was thinking that a data base of crank measurements (I know) would be useful.
When I decided to swap a Solo 681 crank into a Dolmar 7900. Randy and I measured and compared cranks (I know).

Could really open the door for some cool builds.

I’m not asking you to pull out your crank and measure it, simply measure it, if you’d like, next time you have it out (I know).

Here’s the original drawing I made for the Solo/ Dolmar swap and a blank that can be printed, reproduced, altered, etc.

View attachment 158977 View attachment 158978

You can measure your crank, and you can measure your friends, but you should never measure your friend's crank...

 

[Fruecrue]

Added a bit.
Girth is just as important as length (I know).

 

[Fruecrue]

How big is your air filter?

You first.

 

[Mastermind]

Great thread Brody.

 

[Fruecrue]

Great thread Brody.

Thanks boss.

Useful tidbit;
To convert mm to inches, simply divide by 25.4

 

[David Young]

A pic may be useful too.

I think this is great and we should do a piston one too

 

[XP_Slinger]

Another useful tidbit for figuring metric displacement.

Stroke x Bore(sq) x .07854
—————————————— = CC displacement
100


Sorry for the crap format, won’t stay the way I have it typed before posting

 

[David Young]

@Fruecrue

Brody maybe a spot for the thread size and pitch

 

[cus_deluxe]

So what about guys who “stuff” their cranks? Is there a performance enhancement, or is it just for looks? Asking for a friend...

 

[Loanstar]

Probly shouldnt measure the tube socks. (You know)

 

[Fruecrue]

@Fruecrue

Brody maybe a spot for the thread size and pitch

Stop yelling at me David.

 

[Fruecrue]

Older 064/ 066
Work in progress, need thread sizes for flywheel nut and clutch.