hi, i have a 1275 (1100s) block which is going to the rebore's soon. the crankshaft is cross drilled. and has the standard cam which i plan to change.
but i'm woundering if the extra money will be worth it. is there noticible different between both engines power. plus i'm wanting to know what would be the best cam (mid range) for the motor. i here that you can get them re grounded to your specs, but if i can, i would like a new one. what would be the cost of a new cam shaft and where would i be able to purchise it from.
if anyone could reply that would be great ,
thanks

yes 50

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1967 Mini Deluxe 1275 heaps of modifications
1969 Mini Matic 1100

In my opinion there's only one cam you should consider called a RE 13.

As for re boring or overbore the engine I don't know enough to tel the proper facts al I know is I had my engine at 1330 and now 1360 and I notice more torque. I also changed my carbee at the same time from a 1 1/2 SU to a 1 3/4 SU.

Good luck and as above these like 50 I'd say even more then that who has the knowledge to help you further.

hi, thanks for the reply. where would i be able to get the RE 13 cam from. and is there much trouble when over boring the engine. meaning parts wise like head gaskets and any other parts.

thanks.

RE13 cams are usually reground onto a stock cam supplied by you.
Contact Russell Engineering-
(02) 9630 2195.

I run a 1360, I've also built 1380s, and there is no head gasket problem with either a 1360 or 1380.
I recommend a Payen BK450 head gasket. Available from most Mini parts places.

Whether you go 1330, 1360 or 1380 is your call. Not much difference in power really.
I recommend not going all the way to 1380 now, keep that for the next rebore.

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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.

As the doc said. If it needs a re bore, only go to the next possible size, not all the way. 1275 blocks are just too hard to find, so if you go to 1380, next time it needs a rebuild you will need a new block.

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Cant you resleave the Block?

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If it cant be fixed with a hammer it cant be FIXED!!

Yes sure can, but at around $600 for the exercise it better be an S block..
For common or garden 1275s it's hardly worth it.

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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.

Yes
But you will also need more than one carbie on a 1380

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SW5 or 731 would make good camshaft choices

Nah... 731 is too tame, and SW5 even tamer...
Work OK for small motors...
An RE13 will beat both easily for HP.

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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.

go to 1360 before going to 1380. In the simplets terms the power difference will be (1380 - 1330) / 1330 which is 3.8% which is Bugger all!

The difference between 1360 and 1380 is 1.5% which is even less than bugger all, and you will have another rebore left on the block.

Go the RE13!

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Lillee - 1969 Morris Mini K

hey, thanks, so what size is the over bore from a stock 1275,
.060" or larger or smaller. i'm just wanting to know so that i can arrange what size piston i need.
thanks

+.060" gives 1330cc,
+.094" (73mm) gives 1360cc,
+.115" (73.5mm) gives 1380cc.

I'd recommend either Hypatec or Russell Engineering pistons. They are both very strong.

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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.

& if/when doing the re-bore, make sure you have the engine reco place "OFFSET" the bore to suit the head gasket spacingingingings-ings-ings



If the engine shop doesn`t know what you`re talking obout with "OFFSETTING" the bores then don`t leave your engine with them,,, they obviously havn`t done mini donks before if that`s the case.

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.