High Tensile, mains bolts
Turbo Mini Forums

Cheers carl will get on it this weekend, Its alot easier when you have a part number!

On mine (which Carl supplied, thanks again!!!) one was very close to bottoming out in the hole even with the washer.
I depth mike'd all six holes and they varied by 2mm, and of course it was one of the centre ones that was the shallowest. The cap had had the bare minimum shaved off so to be on the safe side I machined 1mm off the end of each bolt.
The easy test was to screw the bolts in WITHOUT the washer until they either touched the strap or bottomed in the hole without touching the strap (as one of mine did).
Otherwise, brilliant - they have the next size up AF head to the standard or MiniSpares so they spread the load to the strap at a greater radius, and hence over a larger area.

Rod.

Schrödinger's cat - so which one am I ???

Edited by Sprocket on 29th Feb, 2008.

i only ever pulled the bolts down to the standard setting, no props,

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

Sorry to dig out the old thread. Does anyone have product number for those longer ARP main bolts?Or is it just 743-3500 and 743-3750 (Cro-Mo 5 pack with washers) ?
Cheers

Edited by Saint on 2nd Jan, 2009.

Well surprise surprise just checked my main strap bolts......... 3 stripe think i will get on the blower tomorrow to rob walker :)

That mini is determined to Kill me!!!!

Not sure what you are looking for when you say "longer"

the ARP part number for:
7/16"-20 x 3.25 12pt is 743-3250
7/16"-20 x 3.50 12pt is 743-3500
7/16"-20 x 3.75 12pt is 743-3750
7/16"-20 x 4.00 12pt is 743-4000

There are a bunch of different washers to choose from so I just scanned in the page.

My bad.I was thinking of 3.5" under head length for my 1" main strap. I'll just order the five-pack You mentioned.
Thanks Mike

Edited by Saint on 6th Jan, 2009.

1310cc TWINK - T Conversion

APT in the US. But remember to state which thread type you have on the outer holes in the block

There are no "bolt" kits available that I am aware of, having recently tried to source some.

Aptfast.com sell a mains stud kit with an add-on pair of studs for the 4 bolt main. Beware that the extra two studs are UNC, so if your block is tapped UNF, as it should be, then they will not fit.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hi,

http://www.aptfast.com/

(all pages viewed are aptfast.com - cant be more specific sorry!)

Is this the UNC bolt your referring to?
MCS 1: 'Extra 2x Studs With Nuts/Washers UK 4- Bolt M/cap (7/16")' because they also have this MCS 2: 'Extra 2x Studs With Nuts/Washers APT 4-Bolt M/cap (3/8")'. Is it the 7/16' or 3/8' (I have an MG Metro Block).

If they are both UNC then thats a right pig as iv already partially built the engine, and any retapping now will make it all messy again :/ What would you advise?

And I dont want to stick with the bolts supplied with the 4 bolt centre main as they are grade 5 :/

Are blocks UNF in standard then?

Is it worthwhile installing these aswell do you think?

MSA 54 'Main Stud Kit 1275 A Series (Converts from bolts)' turning them into stud and bolts.

Thanks,
Chris.

Edited by Mr Mini on 20th Jan, 2009.

1310cc TWINK - T Conversion

The MCS 1 is the problem.

Your mains should be tapped 7/16" UNF

I'm using 2" long 7/16" UNF cap head screws for the outers and 1/3 of MSA54 for the inners.

See my post in the "for sale" section. Unfortunatley I've now sold all my spares.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

1310cc TWINK - T Conversion

I got the cap heads from a local fastener place, try Yellow Pages.

The studs in MSA54 are long enough for the 4 bolt main cap. It not as if it is anything like as thick as the standard cap with a strap.

I've bought std mains bolts for the other caps and, to be honest, they are probably perfectly adequate for the inner centre bolts.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Only just read this thread, will go check our kits now...

Just an update, i've ammended all our kits to contain the grade 8 bolts now.

good stuff

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

"did you know you can toast potato waffles?"

just to check gavin ,if i get the ms strap for a 1098 , it comes with grade 8 bolts for sure ?
thanks
robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Yes they will do, however i'm just waiting for the bolts to arrive.

ahh i see , thanks for the heads up ,any idea on delivery ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

PM sent

well i got a strap ,thank you gav ,and i opted to get it without the bolts, cos im impatient and want to get this engine together ,so thought ,hey i'll get some bolts ,no problemo....

hmm

well so far ive searched for about 15 years ( allowing for the most marginal exaggeration)on the various catalogs and sites for a 7/16 unf 3.25 inch bolt..nuffin ..

so pm'd carl and colin to see what they did /have ,no reply so guess they are away ,rod replied ,thank you rod ,to say he got some from carl,but i realized carls are too long anyway..
hmm
ill try callling ians connection on tuesday ,see what they can do ..
just sharing this in case anyone else is in the same boatski.

Edited by robert on 24th May, 2009.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

robert,

try TD, he had some nice bolts for centremain straps on the bay the other week

I just looked at the centre main strap I got from minispares north a couple of months ago and it has three stripe bolts in the pack. I'll have to give them a call on Monday.