948 - poor performance
Posted: Sat Mar 04, 2017 9:10 pm
Hi all,
I wonder if you knowledgeable folk could help as I'm tearing my hair out.
A branch member came to me with his car (Series II with 1098 engine & box) as it was burning a lot of oil and was in need of a rebore/rings/pistons, so to cut a long story short he decided he wanted me to fit a supposed known good 948cc engine (eBay special).
Anyway, I fitted the engine as well as an alternator conversion and electronic ignition. The car now suffers with a lack of power.
I converted back to the points and it's running ok at tickover but I feel it's not pulling as it should.
I have fitted the dizzy and carb, manifold exhaust, etc from the 1098 engine.
Just to fault find, I swapped the carb over from my everyday 1098 car and no difference to either car (mine still runs fine and the 'project' still lacks power). I statically set the timing (and checked again) to 5 degrees BTDC as mine is set to. After a run, the plug electrodes are the right colour (grey/brown tips). The compression is about 140psi on all 4 cylinders.
I have set the rocker clearances as per the book as usual.
I have also replaced the rotor arm, dizzy cap, points and condenser.
Any ideas? This one has me scratching my head. I have previously fully rebuilt 1098s no problem, but not had much experience with 948s
I wonder if you knowledgeable folk could help as I'm tearing my hair out.
A branch member came to me with his car (Series II with 1098 engine & box) as it was burning a lot of oil and was in need of a rebore/rings/pistons, so to cut a long story short he decided he wanted me to fit a supposed known good 948cc engine (eBay special).
Anyway, I fitted the engine as well as an alternator conversion and electronic ignition. The car now suffers with a lack of power.
I converted back to the points and it's running ok at tickover but I feel it's not pulling as it should.
I have fitted the dizzy and carb, manifold exhaust, etc from the 1098 engine.
Just to fault find, I swapped the carb over from my everyday 1098 car and no difference to either car (mine still runs fine and the 'project' still lacks power). I statically set the timing (and checked again) to 5 degrees BTDC as mine is set to. After a run, the plug electrodes are the right colour (grey/brown tips). The compression is about 140psi on all 4 cylinders.
I have set the rocker clearances as per the book as usual.
I have also replaced the rotor arm, dizzy cap, points and condenser.
Any ideas? This one has me scratching my head. I have previously fully rebuilt 1098s no problem, but not had much experience with 948s