[urq] Coincidence or just plain stupid ?

[Maurits Jonkergouw]

I've added 0,25% Acetone added to my fuel (200 ml per full tank) and drove approx. 2000km with it, def. noticing some (but not vast) improvement in throttle response, low RPM torque and fuel economy.

Unfortunately, just days before MOT, the exhaust manifold has become noisy and is blowing somewhere near the head surface. I'm not sure where exactly and can't tell if it's warped or cracked, if a EM gasket is blown or if it's just a loose or snapped EM stud. The RH engine mount is sound as far as I can tell (oil sump/subframe clearance is perfectly horizontal). 

So either way the EM (including IM, Turbo + downpipe and perhaps Head) has to come off and needs inspection (doom scenario of broken studs > head removal > cracked head upon R&R > brrrrrr....)

Could there be a relationship between the two? Acetone increases exhaust heat due better combustion and could be the final blow on the already weakened EM ??

...or is it just coincidental and impossible for Acetone to warp/crack EM's or blow gaskets in such manner ??


PS the EM and head etc. has been replaced at 80K km back in late 1989 as part of a total enige rebuild by the first owner due a blown oil cooler hose.


Regards,
Maurits

1986 GV (300K km)
1985 CGT KV
1982 GL DD