cradle attachment drawing
[Edited on 21/2/08 by twybrow]
I have to bolt my engine cradle onto my chassis. The cradle sits on top of the chassis rail. I have used 4mm plate on the ends of the cradle, that
will be bolted to the same size plate welded to the chassis. I have 2 bolts in each of the 4 legs, and wondered what size bolts people would use? I
currently have 8mm bolts in there (total of 8 bolts over the cradle). Please pic below for an idea of the arangement:
cradle attachment drawing
[Edited on 21/2/08 by twybrow]
If you're using 12.9 bolts 8*8mm bolts should be more than enough.....
10mm will do it
8.8 8mm bolts will do it too!
most engines are fastened in with maybe 3 M10 studs.
8 8mm bolts is more than plenty.
tom
3 different views thus far....!? Keep 'em coming!
8mm bolts will be ok but 10mm would be better.
I have made /fitted 3 bike engines now but i put the bolts vertical if you look at roadrunners photos you will see what i mean i think thats the
best way
only my opinion 
Jacko
I do like that method... However the frame is made, and I am not cutting it up again!
Well based on the size of the original engine bolts on the bike, which is 12mm, and the fact that ive use suspension bushes to mount the engine on,
and the fact that i probablyover engineer thins on the safe size, ive used 12mm . So id say 8mm was quite small, and 10 would be good.
quote:
Originally posted by ChrisS
Well based on the size of the original engine bolts on the bike, which is 12mm, and the fact that ive use suspension bushes to mount the engine on, and the fact that i probablyover engineer thins on the safe size, ive used 12mm
M10's on mine
it all depends how it is fixed and torqued up.
Also the surface on the plates is an import figure...
in the end the bolt only has his normal axial load... and the plates are pressed together and that is the resistance the engine sees.
If the bolt would be loaded for shearing off then it would be another thing....
8.8 M8 will do the job. (i used 4 of them)
also i used M10 ones
Tks