Page 1 of 1
1850 compressions
Posted: Fri Sep 16, 2005 4:18 pm
by dollysteve
I have just done the compreesions again on my 1850, the results were: 4- 150psi, 3- 150 psi, 2- 120 psi and 1- 150 psi, can someone tell me what the compressions are meant to be I seem to have misplaced my manual, obviously number 2 is a good bit down on the rest, could this be the cause of my nasty running problems?????
<p>1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1994 VW Golf GTI</p><i></i>
Re: 1850 compressions
Posted: Fri Sep 16, 2005 4:32 pm
by davepoth
150 sounds pretty good. I think a sprint should be around the 160 mark and the 1850 runs slightly lower compression. Generally, as long as the compressions are pretty close together it shouldn't be a problem, but a 30psi difference is probably something that's worth investigating.
<p></p><i></i>
Re: 1850 compressions
Posted: Fri Sep 16, 2005 4:43 pm
by alun n
Almost definitely the cause. Pour some oil down the bore and test again to see if it momentarily increases (rings), but from other symptoms I'd suggest valve trouble of some description.<br>
<br>
Good luck with your studs!<br>
<br>
I have a spare head off the car already if you need one...
<p>1973 Dolomite Sprint<br>
1974 Dolomite Sprint<br>
1977 Dolomite Sprint (Pageant)<br>
1977 Dolomite Sprint (White)<br>
1979 Dolomite Sprint<br>
1979 Dolomite 1850HL<br>
1980 Dolomite 1500HL<br>
1998 Lotus Elise<br>
1999 Alfa Romeo 166 2.5 V6<br>
1999 Alfa Romeo 166 3.0 V6 (well...it was there wasn't it!)</p><i></i>
I agree....
Posted: Fri Sep 16, 2005 11:14 pm
by Jon Tilson
One of Mine has even compressions and still idles like a camel. If yours is that far adrift on one pot it will be rough....prolly a valve...<br>
It would smoke if it was a ring and you'd get crank pressure.<br>
Jonners
<p></p><i></i>
I`m back now....
Posted: Mon Sep 19, 2005 8:03 am
by dollysteve
Thanks chaps. I had an idea that it was the cause of my poor running but thought it wise to check it out with some of you more experienced custodians. I tried the oil down the bore trick and it didn`t make a blind bit of difference. Head it is then!!!! <br>
Alun, thanks for the offer but I have the TR7 engine to go in and also a spare TR7 head and also an 1850 engine kicking about in the garage, of course there`s also one on the auto if need be. Looks like the transplant might come sooner than I thought.
<p>1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1994 VW Golf GTI</p><i></i>