Thread: Help...2L engine backfire with flame and power loss

I made a tool the same as Arthur's but I haven't used it for that job - I used it to test for burnt exhaust valves; feeling for air at the exhaust pipe.

An alternative to air to hold the valve in place, is a length of synthetic cord such as used on chainsaw pull-ropes. Feed the end into the cylinder until enough has gone in and then turn the crank by hand, until the piston jams against the cord and hopefully the valve-head.

I say hopefully, because the S1 piston crown isn't flat, so it may not want to play the game,

Cheers Charlie

well no backfiring or poping through carbie, sounds smooth{smother than it was}
oil pressure sit on 50 55 psi at idle and at the moment 60psi at 30 mph in 4th gear....still smoking but new rings/big ends valves etc and missing the oil metering plug in the head still id guess it would.
i might make it to the saftey check tomorow after all,and put the smoking down to running in etc after all its only got 10 miles on it.

have some ford valve umbrella seals arriving tomorow and the metering plug on order from odl blighty.

guess ill decide in the morning weather to give it a go or wait...

thanks everyone for youre help
mark

Originally Posted by mfc

oil pressure sit on 50 55 psi at idle and at the moment 60psi at 30 mph in 4th gear

IMHO that oil pressure is a tab too high, might be a good idea to reduce the viscosity of your oil a bit.

still smoking but new rings/big ends valves etc and missing the oil metering plug in the head still id guess it would.

I wonder if a split pin would have closed that hole enough to reduce the flow.

have some ford valve umbrella seals arriving tomorrow and the metering plug on order from odl blighty.

the book said 55 to 65 at 30 mph..the 50 at idle was a concern though all i could find was the "over 20 psi at idle}.. What do you have yourse set at? I asume minimum is set by oil viscosity

the oil may be a bit heavy its penrite classis medium{the old engine needed it so was on hand}, should go to light.
I was thinking it will change with the metering plug in anyhow{psi} as the feed to head gets reduced...
anyhow its a 15 min road test if it can put down the smoking for that long i think it will pass..

My book says 35 to 40 PSI at 30 MPH. Have you tried adjusting it with the oil pressure relief valve on the side of the block?
Operation A/24 .

hmmmm 2L 1955 engine opperation AO/6 check that at least 20 psi at idle. adjust to 55psi to 65 psi at 30 mph thats from the black fronted workshop manual...1960 second edition{ pdf}
where the old engine needed thicker oil this one likley needs thinner..
ps it settles on 40psi at idle when warm and just under 60 psi at 30mph in 4th gear on flat road{ajusted with releif valve}

So different engine{1600 or siamese?} or typo in my manual????? {ps its a 1957 engine}
regards mark

Yours could be right. Mine is 1954/55 1st edition Jan 54 so they may have changed it.
Keith

ill try and find another version{got a hard copy of original coming by post}
...Yourse being 54 it might be the early 2 L engine although the illustration in mine is of a canister style oil filter {older style siamese 2L ??}.

anyhow its bucketing down so the guy aint going to want to drive it far lol...im thinking get it passed then work on the oil flow to head and clarify the oil pressure info differences in the books..and probably change to a lighter oil real soon.