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engine swap


Alan Crook

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Hello Alan.

I'm with Peter James and they take a very pragmatic view on items that increase or improve safety. On declaring that I had fitted MGF seats to the Vitesse for comfort and safety reasons (headrests) they were very happy with the upgrade stating that the seats would reduce any whiplash injuries should a touch ever occur. 

Therefore if you declare the rationale for the upgrade and can state that safety has been improved as a result, then I feel you will be viewed favourably.

At the end of the day, any mods should be declared upfront to prevent Insurance Payout Wriggle !! 

Good luck.

Richard.

 

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Perhaps you may be better contacting the insurance company and get some quotes / views / restrictions from them regarding engine sizes. I'd probably look to do that first before getting ahead of yourself and a phone call could save you a lot of grief and wasted spannering hours.

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In 1972/73, when Triumph upgraded the USA Spec MKIV Spitfire with a 1300 engine to a 1500 engine, all they did was change the engine, leaving the remainder of the drive train, brakes and steering unchanged.

In 1974, the UK/European upgrade from the MKIV with a 1300 engine to a 1500, with a 1500 engine, the gearbox was also changed from a three rail box to a single rail box.  The other running gear, suspension, brakes and steering remained unchanged. 

A few years later they introduced dual circuit brakes.  

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One detail you will want to consider is clutch.

The 3 rail box (presume that is what is on your 1300, it was from the factory) has a 10 spline input shaft and 6 1/2" clutch. The 1500 spit uses a 21 spline shaft and 7 1/4" clutch

Simple solution is a conversion clutch plate, OR use the flywheel off the 1300.

You can also use the exhaust manifold off the 1300. May lose 1 or 2 bhp, but (a) you don't need a new frontpipe. and (b) the 1500 manifold/downpipe is renowned for being a problem and needing regular gasket changes.

At some poibt you will probably want to swap the diff to he 1500 type, but that is a straight swap.

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31 minutes ago, clive said:

One detail you will want to consider is clutch.

The 3 rail box (presume that is what is on your 1300, it was from the factory) has a 10 spline input shaft and 6 1/2" clutch. The 1500 spit uses a 21 spline shaft and 7 1/4" clutch

Simple solution is a conversion clutch plate, OR use the flywheel off the 1300.

The conversion plate to use a Spit 1500 flywheel and clutch on a 3 rail gearbox is a GCP103

https://www.canleyclassics.com/demoapp/?ptno=GCP103

https://www.rimmerbros.co.uk/Item--i-GRID005553

http://www.moss-europe.co.uk/plate-clutch-7-1-4-gcp103af.html?assoc=148445

 

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THANKS EVERYONE ,already done the single rail and o/d swap,fellow from Leamington sorted me i think it was a Toledo   6 .1/2 inch clutch plate 21 spline . Now where do i get a good  1300 or 1500 engine. or shall i get my old one rebuilt. Dont tell the wife.

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