Hi all,

Just out trying to get the Pinto running a bit better with the megasquirt, and trying to get it to start from hot (which it's now just about doing..) - the engine was idling (quick, about 13 - 1400 rpm), and all of a sudden, the whole throttle body assembly (including the airbox) popped off the inlet manifold...

Anyone any ideas what could have caused it? I can only presume that it pressurised somehow, but how?

Cheers


Vince

Is there a groove machined into the inlet tract ? if not this could be the problem, the pipes connecting the two usually seats in the groove when clamped up.

Hope that makes sense

I know what you mean, but the rubbers stayed on the manifold, not the throttle bodies. There is a groove on those, it may not have been quite tight enough. I've done them up again and I'll see how it goes....

Ta


Vince

does any part of the TB/airbox assembley hit anything? Other than that it could be too much weight/mass and the engine movement is just causing them to come off.

Fit a couple of bracing straps between the airbox and the manifold/head. Seems to be a fairly common problem especially if using silicon hose as mounting rubbers.

I have a tie bar on my TB's just picked up on the top centre and across to the cam cover, these things will rattle loose.

Regards Mark

Have you used normal silicon hoses? imo these aren't stiff enough and as the vacuum pulses it in effect squeezes the hose until they come off. So if you must use hose then I would have the minimum amount of hose between the inlet manifold and throttle bodies if that makes sense. I would also brace the throttle bodies like I've done on my carbs just recently like below.




I managed to get the inlet rubbers that came off the bike and these are really stiff.

All in my opinion of course.

Cheers

Rich

Thanks Rich - I'm using bike rubbers, which are nice and stiff - will look at bracing them up in that case...

Cheers


Vince

Hi, thanks for all the replys, I think the original bike rubbers and a couple of metal braces may be the best solution.Many thanks.

An age old problem :-)

I made up a couple of brackets to keep mine on....