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StuartHorne

TR6, lumpy/missing at high engine load

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Hello TR experts, I am a member of 30 years and still learning about my TR6!

 

I have recently fitted a refurbished Lucas PI and now a refurbish distributor; - it has been pinking, the shaft play was excessive, but all good and new now.

 

Its timed at 12 deg BTDC, now the pinking has gone, but its huleva lumpy and 'missing/sluggish' at higher loads. It revs full range no problem at all on no-load. It has a fast-road cam and flowed head

 

Its not done many miles over the recent 5-6 years [been building my house], but now want to get driving. The fuel may be a little old; but not convinced that is the problem. I'll refresh the petrol next weekend, but interested in any responses in the meantime.

 

I am based in Gloucester, any TR specialist in the area, Google is not indicating as such.

 

tks

Stuart.

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Was the MU set up for the fast road cam?

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Hi, showing my ignorance, ; didn't appreciate the need to set the MU specifically for the Cam.

I'll try the Cardiff contact.

 

Thanks for the help.

 

Stuart.

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Hi Stuart, and welcome.

First I would check that what you think is TDC on the pulley really is. The damper rubber can distort and move the mark relative to the crank. Use the piston stop method to find true TDC. A distorted mark will mean the spark is too retarded, which wont help higher rpm running, and will also kill the pinking.

 

My second guess would be fuel starvation at higher rpm and full throttle. Maybe a clogged fuel filter. Or fuel pressure falling off.

Peter

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Every one running a PI should have a Pressure gauge,

and wid a long enouff lead to go frae MU to inside cabin,

 

check yer PSI at WOT and high revs, saves all the gess work

 

Plug leads brek,n doon

plugs

dizzy cap

rotor arm

wrong valve clearances

bloked fuel filters

wrong petrol

blocked air filter, this will mek it run weak at high revs, oppposite as to a carb.

fuel press too low

sticking PRV

dodgy injector

dodgy MU

dodgy pump

 

M

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FUEL PRESSURE is my guess as found out recently ,started fine and ran well but not top end which i hardly use.

Corrected , now loverly .

 

ROY

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