Re: [DML] Hot exhaust

["Tom Niemczewski" <dmctom@xxxxxxxxx>]

Hi Nick

Check the compression on all cylinders and compare the readings. I would say 
that your exhaust valves on the affected cylinders are not closing properly. 
>From what you are describing I would say it's beyond adjustment now... the 
valve seats are probably badly burned now.
If I'm right you will see a low compression on those two cylinders. If that 
is the case then squirt a little bit of oil into the cylinder and take the 
reading one more time to rule out bad rings. If the reading stays the same 
and it's low you will have to rebuild the cylinder head. And make sure the 
valve lash is properly adjusted on all cylinders.

Good luck

Tom Niemczewski
vin 6149 (in Poland!)
Google earth: 52°25'17.30"N 21° 1'58.00"E
dmctom@xxxxxxxxx
www.deloreana.com



----- Original Message ----- 

> When i had it on the Dyno it started to ping VERY violently at
> around 4000rpm so we had to shut it down. I had some custom cerimac
> extractors fitted and i noticed that the ceraminc coating had
> discoloured on cyclinders 1 & 2 only. (free flowing with no tight
> bends etc)
>
> After the engine has warmed up at a high idle number one and two
> extractors are around 300+ deg c while the rest are around 180 deg c
> hense the reason for the discolouring and i presume the high tepms
> are causing the pinging.




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