mk1-forum.net

Ok guys need your expertise
Just fitted twin 1 1/4 to a 1275 A plus.
First it wouldn't fire up, found the inlet manifold was too high allowing air in so refitted it lower.(it has a big bore inlet head but had a 1 1/4 inlet with hif 44 and ran great)
Engine fired up but won't run properly.
It revs itself really high then drops and revs again
What have we done wrong?
Any suggestions how to fix welcomed
Steve

Sounds like you still have an air leak. Is the centre branch of the exhaust manifold stopping the inlet mount properly to the head face?

I think the exhaust manifold could well be stopping the manifold seating correctly.
I think the weld is a tad too high on the manifold and I will have to grind it a little.

Thanks
Steve

Sounds lean.....I used to have to braze half flat washers to the thick flange washers accomodate and to clamp the factory manifolds with aftermarket headers for the suggested problem you might have...

Thanks for that, I am having another go at sorting the problem this weekend will try that also.
Steve

Going the hs2 twin route on a 1275 with A big bore head cause it won't flow enough to use what spec you've got better off with a hif44 or twin hs4 or twin h4 carbs

Chalkie wrote:Going the hs2 twin route on a 1275 with A big bore head cause it won't flow enough to use what spec you've got better off with a hif44 or twin hs4 or twin h4 carbs

Maybe a period mark could be useful in that sentance?
Capital letters are indeed a good invention as well

Vegard wrote:
Maybe a period mark could be useful in that sentance?

a full stop you mean?

we are not Americans (well, most of us aren't)

oh, and its sentence

I saw that, but the SS-moderator won't let me edit my post

Full stop!

Good thing you are not commenting on the writing styles of another member.....you may well be verbally slammed...lol

On topic..... on three separate installs of twin carbs I had to pull out the grinder....twice on the exhaust manifold, once on the intake side.

Correcting vergs spelling has been a long standing joke between me and him

I can take the high ground as I'm fluent in norweigen......

rich@minispares.com wrote:Correcting vergs spelling has been a long standing joke between me and him

I can take the high ground as I'm fluent in norweigen......

Apart from writing "Norwegian" that is. Two errors in one word there, my fluent Englishman.

Vegard wrote:

rich@minispares.com wrote:Correcting vergs spelling has been a long standing joke between me and him

I can take the high ground as I'm fluent in norweigen......

Apart from writing "Norwegian" that is. Two errors in one word there, my fluent Englishman.

that was a joke as well

you don't win a prize

No, Rich is fluent in "Norweigen", he is however the ONLY native speaker

mk1 wrote:No, Rich is fluent in "Norweigen", he is however the ONLY native speaker

Found the problem, took the inlet manifold off and can see where it is hitting the exhaust manifold, also the flanges on the exhaust are thicker than the inlet.
The inlet flanges are worn down from years of tightening up the manifold.
Going to get a Maniflow inlet which should cure the problem.
Anyone used a Maniflow 1.25 steel inlet.
Steve

Anyone used a Maniflow 1.25 steel inlet.

yes, top gear.

I thought they would be, thanks Mark.
Good thing living where I do Maniflow is just 25 minutes away!

Steve

Yes very convenient!

But thanks to Rich, I have Minispares deliver to my door about 3 times a week at the moment