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dave the rave

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Re: Newbie

Post05 Oct 2018 21:25

120bhp isn't too problematic from a 1275. They can confidently go to 1400cc. A bit more on a stroked Marina crank ( 84mm ).
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Rallyman

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Re: Newbie

Post09 Oct 2018 14:22

Or would a triumph 1500 engine be a good idea?
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dave the rave

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Re: Newbie

Post09 Oct 2018 17:49

Definitely NOT.......a rubbish engine. A stretch too far from its 1300 predecessor. Years ago i spent 16+ years grinding crankshafts, ( have just started again in a company that actually MAKES them from bare EN40B steel bar ). The amount of Triumph 1500s that came in that had the thrust very badly worn, big-ends knocked out and, worse of all, were cracked around one or more of the fillet rad of the big-end, was surprising. With the latter they're scrap. Journals and the thrust can be welded. They don't like high revs either. As i said, rubbish engine. I would'nt beg one.
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Rallyman

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Re: Newbie

Post09 Oct 2018 20:13

Looks like I will have to find a marina 1300 engine then as 1275 are going for silly money
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dave the rave

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Re: Newbie

Post09 Oct 2018 20:51

Bear in mind John, a Midget crank will fit straight into a Marina block. It'll need the Midget con-rods though. In my opinion, the only downside of the Marina blocks is the near upside down oil filter. Though remote filter kits are available.
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stoney13

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Re: Newbie

Post12 Oct 2018 11:50

hi rally man and welcome,if you like the mx5, then why not fit the 1.6/1.8 mazda and box, as you must be aware being an owner of the mx5 you can go with single turbo twin turbo's or even a super charger as the 1.6/1.8 has forged pistons and a decent crank, all you would need to do if fitting a super charger is to fit double head gasket to lower compression ratio. the Mazda engine and box only weigh a few pounds more than the a series and box also on the up side you can get all the bits you need for around £200.00.
best of luck with the restoration ;)
EMA KAY - racing ( A40 s/w group & Wessex group)
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Rallyman

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Re: Newbie

Post12 Oct 2018 14:39

Hi
I would fit an mx5 engine but want to run in the historic class so will have to fit a period engine
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stoney13

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Re: Newbie

Post13 Oct 2018 19:06

ha, you need a 998 cc for a sprite, or 1275 from the midget not that marina thing then ;)
EMA KAY - racing ( A40 s/w group & Wessex group)
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Rallyman

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Re: Newbie

Post08 Nov 2018 19:48

I am nit finding any 1275 engines for sensible prices so am considering going the 1500 route .can these engines be made reliable?
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dave the rave

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Re: Newbie

Post08 Nov 2018 21:06

The only way I'd ever consider a Triumph 1500 would be with an EN40B Nitrided crank and decent conrods. The crank being the main contender. And modified to take two thrust washers each side.
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