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Engine Re-build


DoZ

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OK so I have diagnosed that the front main bearing on my mkII GT6 is on the way out.  >:( As you can imagine this has put the engine re-build rather higher on my list of things to do.

I understand a lot of the work required is dependant on the condition of the engine when I or someone strips it down.  Having said that the question is:

What work/mods would you recommend is/are done when re-building an engine????

eg.
balancing, if so which bits are worth doing?
larger pistons, what size?

etc etc.........

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As you say a lot depends on the state of the engine you pull out but, in terms of machining, balancing the crankshaft, flywheel, clutch and pulley (all together as a unit) and the conrods is a good investment. Crossdrilling and tuftriding the crank along with making sure all the piston heights are the same are other good places to spend money. Should make your engine smoother and more reliable and wont cost buckets.

As for larger pistons the largest you can go is plus 60 but I would only go as large as you need to. There isn't a lot of meat between the bores and its not good to push it. Besides if you go for a huge bore next time you rebuild and find the bores out of shape the block is scrap.

Theres a mountain of other stuff you could do too. Just depends on your skills and budget. You could deburr or paint the inside of the block, do some port matching and some headwork, polish the chambers, get a racier cam, get bigger valves, lighter flywheel etc etc etc....

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Thanks Will

I am not planning to do anything much to the head as I would like to spend some time and money on an unleaded version when funds allow.  For now I am just interested in the bottom end.

I already have a TR5 cam which people seem to think is a good move.  When I first put it in I like to think it made a difference.

DoZ

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Doz,
This page: http://www.totallytriumph.net/spitfire/engine_building.shtml is about four cylinder engines, but is easily translated to sixes.  It's more than a page, it's the most comprehensive review of enghine building I know of on the net, by one who knows how - not me!

John

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Doz - back to basics mate, what's your budget and what's your intended use? Power costs but you don't need to go nuts - a good standard rebuild won't cost the earth, check out the specs and prices from the usual suspects. Don't spend out on stuff to make a killer engine if the car is all standard, suspension and brakes first, power and noise next :-)

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Budget, what budget! :-(

I think the conclusion is replace all bearings and anything I find that looks suspect, get the crack etc balanced and bolt it back together.  Also rebuild the oil pump as this seams to be a job worth doing.

Just need to decide whether to take on the job myself........ (next post "engine is a bag of *&£*$")

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GTEVO wrote:


WRONG ALL WRONG.
Cross drilling is both pointless and expensive
060" is not the biggest size, unless you want to use cr..p AE pistons.

FYI;-
I just made some new 77mm forged pistons for this engine.

No meat???
there's LOADS and loads of meat between the bores, I used to bore them out SIX...yes SIX millimetres!!!!
Try and do that to any other production engine!


Haha! My mistake! I thought we were talking about the shonky old 1500. GT6's are a whole different ball game!

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GTEVO wrote:


here's a list that idiot on T.T. page suggest using....a list of the world's w...nk...rs

Cryogenic f....ckwits??? just what is he suggesting???

Mark Field of Jigsaw Racing Services: In TTG supplier list ...yep can't build an engine to save his life.....
Terry Hurrell of Triumph Tune: Tel: 0208 867 2025 cool rip off service
Gower & Lee: carburettor specialists
Frozen Solid: Cryogenic tempering Suffolk UK: Tel: 01449 674 914 (£600 for engine & gearbox)  NUTTERS!!
EMS Engine Machining Services Web: WWW.ENGINE-w..nkg-SERVICES.CO.UK
CES Power Buckingham UK: Tel: 01280 815 333 Web: WWW.RACEKAKA.CO.UK/

Oh and btw he doesn't list my book in his bibliography which is probably just as well.... >:(



Having a bad day or something?

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