hi, this week i'm planning to do a timing chain conversion from a single row to a double row 1275 set up. i know i have to counter sink the two bolts but i'm wanting to know more information about what else needs to be done to overcome this conversion.
if anyone has any pictures that would be great.
thanks

Buy a Rollmaster Double Row Timing chain... dont need to do anything else except time the bugger in.

Brilliant chain too


Peter.

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do u still need to counter sink the bolts

Nope...

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where can i get one from and how much

Ebay Here

Or shop around... might be some elsewhere... I have no idea where I grabbed mine. Maybe Minis.com.au

Peter.
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You need to countersink for most types, not familiar with rollmaster though

Also check the alignment of the wheels. This is described in Vizard, basically you fit the gear bits without the chain then run a straightedge across and put a feeler gauge in between. Add shims or get the back machined to the feeler gauge dimension. An engine reconditioning shop should be able to help you.

Daniel

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Videos - Turbocharged A-Series on Dyno & at Wakefield
Mafs waz not my strong subgeckt at skkol

so can i still use the orginal 1275 timing setup or not, because i have one now, off my 1275

Yeah, all I can talk about is mine... not the others or other builds.

Anyone else done a rollmaster kit on theirs??

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Sure you can, fit an Iwis chain and it's the same one Rollmaster uses. These are over $50 but the best chain available now.
To time it spot on, use an offset cam key. Available in 1* increments from 1* to 9* from Minispares UK. Some Mini places here carry them too.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

do i need to re time the cam

No, you can just line the dots up but that's not the most accurate way if it's a reground cam. Sprocket timing accuracy varies.
I always set them up properly with a degee wheel, if motor is out of the car. If still in the car there's hardly room though.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Duplex chain is 2x the width of the single, there's not much room behind it..
Peter, I bet Graham had already countersunk that plate before, under the bench drill.
If in doubt always countersink `em- or at least push the chain back and see if there's still clearance. I've never seen a duplex kit that lets the chain clear the standard hex bolts, and it's poor engineering to put a csk screw into a hole that's not machined to suit.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Maybe... unless mine already were countersunk before the Rollmaster? Dunno...

Peter.

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I just pulled a bunch of duplex fitted motors apart - on one I found an alternative: rather than countersuck and screwed, they'd machined down the bolts so they were basically a low profile bolt head.
Those old school racers were (are) notorious bodgers but it had been done well.