Some of you know that I recently purchased a car with a SD4 in it.
The SD is equipped with a pair of Dellorto DHLA 45s.
It seems to run good, but it has a bit of unevenness to the idle (which may be the cam, but it's hard to tell until I get a new header constructed. Right now it sounds like a Harley.)
Using an IR thermometer to read header temps, cylinders 1 & 2 seem to be running significantly cooler at idle, as well.
It has a bit of a stumble, off idle, but when the revs are up it seems to have plenty of power. Not that I have anything to make a meaningful comparison.
It's been years since I messed with a carb, but I have to assume that these were once set up correctly and running properly, so tuning isn't really going to be an issue unless it really needs to be.
The question is where to start.
I thought about rebuilding them, but if it's just a matter of removing all of the mixture screws and blowing air through the jets and the passages, I'm all for it.
I would tend to suspect that the screws haven't
been messed with by any recent previous owners, but before that, I don't know.
I have ordered the "glossy cover" book that is available. I plan to read it carefully before I do anything.
Is this something that I can just run a can of Seafoam through, and expect any meaningful results?
(I thought about just replacing the manifold and installing a Holley 2 barrel, but I don't have a lot of love for Holleys, and everywhere I look I seem to find a lot of glowing reviews for the Dellortos. So I guess I'll keep them unless I get convinced to go in another direction.)
Thanks for any tips.
[This message has been edited by Raydar (edited 01-23-2015).]