Conversion-CIS to Webers

[Alan.UK]

Thanks Chuck,

Would you mind PM your contact number as it would be great to talk. I was going to buy a MSD set up as I do not have a spark box or coil and I also need a distributor so it seems this could be the best way forward, and get it all in one go.

Hey maybe you can pop over the great pond and give me a hand_grin.

Thanks

Alan (Bournemouth - South coast of England)

PS. Chuck, the link you sent, which one do I need to buy ? and which ignition wires ?

[Wayne 962]

Originally posted by Alan.UK
Wayne, I will be using my Max M 98mm with the S grind cams. Do you know if there are still clearance issues with these, and if so what are my best options? Is it best to deepen the pockets or maybe use spacers, I guess it depends on how tight they are and also the desired CR. I will be running standard fuel with single plug.

There were several versions of these pistons. If they were designed to be used with CIS, then you will most likely have clearance problems.

You'll have to cut the pistons if you do - I'm not sure what you mean by spacers...

-Wayne

[chuckw951]

Originally posted by Alan.UK
Thanks Chuck,

Would you mind PM your contact number as it would be great to talk. I was going to buy a MSD set up as I do not have a spark box or coil and I also need a distributor so it seems this could be the best way forward, and get it all in one go.

Hey maybe you can pop over the great pond and give me a hand_grin.

Thanks

Alan (Bournemouth - South coast of England)

PS. Chuck, the link you sent, which one do I need to buy ? and which ignition wires ?

Sure I'd be happy to chat with you...

Pulling the stock crank pulley wasn't easy, had to use an impact wrench. Oh, and had to grind down the engine mount bar for some additional clearance, check out this link is you haven't seen it before 3.0 into 69 911E woes
This thread details the HPX install.

The product does come with decent installation instructions, though the wiring for the relay is a bit confusing.

When you're ready to buy I'm certain Pelican staff can help with the PNs. I mounted the HPX on a bracket between the carbs.

[john walker's workshop]

regarding swapping distributor gears, that would of course make the distributor run backwards, but the mechanical advance wouldn't work going in the opposite direction.

[Alan.UK]

Hi John,

If I was going to swap the gear I would be swapping the drive gears from the crank and then use a early (2,7?) dizzy. But, it looks like I am going distributor-less now with the same set up as Chuck.

Thanks

Alan.UK

[M491Cabriolet]

It’s ALIVE!!!!

This 15 year old thread caught my attention and created curiosity for me. Has anyone ever done a proper CIS to Weber swap in the past (changing cams, pistons and all) and later go back to CIS?

If so, do the different cams and pistons work well with CiS, or is it necessary to go back to mild cams and CiS pistons?

Considering this at the moment....

Thanks!

[safe]

Originally Posted by M491Cabriolet

It’s ALIVE!!!!

This 15 year old thread caught my attention and created curiosity for me. Has anyone ever done a proper CIS to Weber swap in the past (changing cams, pistons and all) and later go back to CIS?

If so, do the different cams and pistons work well with CiS, or is it necessary to go back to mild cams and CiS pistons?

Considering this at the moment....

Thanks!

You would at least need to go back to a milder cam.

[targa72e]

The more aggressive carb cams cause problems with reversion in the intake tract that mess with the CIS AFM. This is the reason CIS and stock EFI use milder cams. This is mainly a problem at idle. I had a friend who ran CIS on a RS spec 2.7 engine with E cams for a while. He had to set the idle at around 1200 RPM for it to work. S cams would have required even higher idle speed.

john