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blanking throttle body holes
will121 - 21/12/08 at 10:26 PM

ive jut in the progress of respacing my GSXR600 throttle bodies for a zetec and have heard about blanking off the injector and secondary butterfly holes with chemical metal.
Does this work and is it i long term solution? just worried about it gettin sucked out! Rescued attachment throttle bodies 002.jpg
Rescued attachment throttle bodies 002.jpg

JohnN - 21/12/08 at 10:30 PM

Where will you put the injectors then?

will121 - 21/12/08 at 10:39 PM

quote:
Originally posted by JohnN
Where will you put the injectors then?

im going to use the standard Rs1800 sandwich plate which has the injectors, fuel rail and regulator and bolt on my throttle body flange to that

Lars - 21/12/08 at 11:29 PM

I used chemical metal, and would not do so again.
I came loose and lodged itself in the port entry.

Lars

blakep82 - 22/12/08 at 12:13 AM

quote:
Originally posted by Lars
I used chemical metal, and would not do so again.
I came loose and lodged itself in the port entry.

Lars


just as well i didn't put it round the inside of my manifold!

stevebubs - 22/12/08 at 01:14 AM

I'd measure the holes and get a piece of ally made up a on a lathe...

Then tap it in (with a dab of bonding agent on the upper part if you haven't made it an interference fit)

stevebubs - 22/12/08 at 01:16 AM

The locost and least effort solution would be to tap the holes and stick a bolt in (not the prettiest, though)

stevebubs - 22/12/08 at 01:16 AM

You could always fit a second set of injectors for when you go forced induction, of course....

will121 - 22/12/08 at 08:23 AM

quote:
Originally posted by stevebubs
The locost and least effort solution would be to tap the holes and stick a bolt in (not the prettiest, though)


im glad i asked rather than went the chemical metal route, sounded to easy! will turn some bungs up for the injector holes and secure with a piece of ali angle, but the bolt option may do the secondary butterfly holes though.

rpm - 22/12/08 at 05:14 PM

i temporary tape the holes inside with duct tape then fill the holes wiyh araldite or similar, this produces a nice 'domed ' finish Rescued attachment HPIM0139.JPG
Rescued attachment HPIM0139.JPG

Jenko - 22/12/08 at 05:56 PM

The chemical method is fine IF....

a). You ensure the mixture ratio is correct
b). you form them so they are held in like a plug (i.e. the back of the plug is bigger than the front).

I did an experiment where I left them in fuel for a few weeks, and it did not seem to degrade the chamical metal (unlike the silicone hose).

plus, as they are upstream of the injectors, they should not come into too much contact with fuel.

Lars - 22/12/08 at 08:38 PM

I used the CM as a wedge to smooth transition from manifold tube to the oval zetec port.

Therefore in my case it did have some contact with fuel.
From memory, I also believe that the CM was slightly porous, and absorbed some petrol.
Maybe that together with engine heat caused the trouble.

Lars

Jenko - 23/12/08 at 04:30 PM

I agree Lars, I'm not sure I would use it for that purpose, I guess there is also potential for movement at the interface.....

I've also heard horror stories of people trying to choke the throttle body using this stuff...Again, I wouldn't....

I think for the purpose of filling small holes upstream of the fuel it is ok....A machined plug will always be the best option though.

Paul.

donn006 - 30/12/08 at 05:03 PM

hi when i did mine i got some rubber bungs fron the scrappy they are on an mk 4 astra front landing panel where you adjust the headlights they fit perfectly in to the injector holes and look as if they were ment to be there