98mm Max Moritz (70.4 crank type)

[Alan.UK]

Hi all,

Can anyone help me with some advice please? I may be buying some Mahle, 98mm, Max Moritz pistons (these are for a 70.4 crank ie a 3.0 ltr SC motor). I know these are for the CIS set up but I am going to be using weber 40 IDAs, is this still a good idea or is there no real gain ? Surely still increasing the CC will still prove a good motor even with the webers.

Also what cams have people used on this set up? I have a set of early S cams but have read that the valve pockets may not be deep enough. Do 964 cams offer a good torque curve for this set up and are these a direct fit in the 3.0ltr cam housings.

I do not intend to go twin plug, but I am really after a more plug and play set up ? I also already have an early SS exhaust set up with twin outlets.

Any advice is much appreciated. I would really like to hear from people whom have done this and maybe even have this set up in the their car right now.

Thanks in advance

Alan.UK

[Doug Steinel]

Alan,

See the thread from Feb 8 on "3.0L modification."

[Alan.UK]

Thanks Doug,

Thats some good info, but I really need to know if anyone is running carbs with the 98mm, Max Moritz pistons for the 3.0ltr creating a short stroke 3.2. These are the wedge shape ones for CIS but I would like to use them with carbs.

Anyone ?

Wayne ?

Alan.UK

[Wayne 962]

Sure, they'll work fine with carbs. Run as hot a cam as you can, or machine deeper pockets in the pistons...

-Wayne

[Alan.UK]

Thanks Wayne.

I have offered to buy some S grind cams, so fingers crossed.

Alan.UK

[Alan.UK]

I have bought a pair of Andial 4 bearing S cams from a fellow member. Does anyone know if there maybe clearence issues with them and the Max Moritz pistons and if so how much to have the pockets machined by ?

Thanks in advance

Alan.UK

[Wayne 962]

You'll have to measure them when you assemble - I don't know of anyone with this info...

-Wayne

[Alan.UK]

Thanks Wayne,

I aim to document this rebuild as I know the short stroke 3.2 seems to be getting alot of attention recently. Engine is a 79 SC 3.0ltr. Will have 40 idas, and early SS exhaust. It will also be set up on a rolling road (US - dyno) so I will also get some figures on what this set up produces.

Thanks again

Alan

[Alan.UK]

I know have the 98mm Max Moritz set up but need a complete new set of rings.

So I now have all the parts.... as soon as my 3.0ltr core arrives its all systems go.

Alan.UK