Is this a new thing now? I got a sheet here that says i 'HAVE' to countersink the big end caps by 1mm prior to fitting the bolts.

What a load of gay that is!

 

No, thats how ive always done them, cause they have a radius on them, and otherwise you end up with the contact between the rod and the bolt being on that not on the head of the bolt.

 

Got any pics or info on how to do it properly Chip? This SBD sheet is fucking shite!

 

surely this is standard practice with any hi-tensile bolt application, unless the drilling has enough clearance to allow the bolt head to get full face contact away from the head/shank radius? All bolts will have some radius where head and shank meet?

 

Spence, its REALLY simple, just get a counter sink bit and twist it in the hole a bit, noting to it!

 

yeah, but when its countersunk, it leaves a tapered top, and i can't see that giving full face contact for the underside of the bolt?!

 

Been done on the modified XE for years

 

only needs enough to be certain that the face of the bolthead makes full contact with the cap face, no more. May well just need the edge knocking off the cap drilling.

 

kinda like this, had mine reamed by the engineers (zetec rods tho)

 

Here's mine.

I'll just drop the rods off to my mate tomorrow, sort him out a tenner and he can do it, if he fucks it up, then its down to him

 

You only really take the corner off the radius on the arp bolts is only quite small but as allready mentioned if you dont do it the 2 faces will not come together properly

 

see the gold inner ring spence?

about that much is all you need!

 

Cool, and what's deburring? Is that flatting the top off?

 

Deburring is just to remove a sharp edge when you cut metal or drill holes the sharp bit is known as the burr

 

Cool Cheers everyone

 

no problem