2.4 S Engine with E Cams?

[kugelfischer]

I recently learned from my car's PO that when rebuilding the engine (back in '88), Bruce Anderson recommended that he run 'E' cams with the 'S' P&Cs.
Does anyone have data on how this would modify the power/torque curve? I know that city drive ability would have been improved, but what should I expect for peak HP?
Also, I need to contact Gus, but would the 'S' MFI space cam work well with this setup?

Engine runs great, just trying to understand the build. I'm also debating on a long term project of putting the 'S' cams back in.

Cheers
Kent

[Eagledriver]

Kent,

While the S space cam may not be optimal, it's probably close enough. I had a 2.7 engine with Solex cams that I switched to S cams. I was disappointed to find only a small increase in power and only above about 6500RPM. The loss of torque was very apparent. If you are determined to change cams I'd go with Solex at the most.

-Andy

[cmcfaul]

S engine with E CAMs is the best of both worlds. You get the compression ratio of the S and the torque of E.

A stock E is quicker to 60 than a stock S because of the cams. Adding the E Cams to the S engine is a GREAT combination.

You might want to consider the DC30 cams (mod solex). They have the lift of the S and everything else is between the E and S.

Chris
73 911 E

[gsjohnson]

Bruce Anderson also states that the S piston/E cam combo gives up some low end driveability. He scared me with that statement so I stayed with the E pistons. And with todays gas, I was also worried about the higher S compression. I also went with the DC30 Mod Solex cams.

[kugelfischer]

Thanks for the input. I have found my MFI 'S' engine to be great at low revs with E cams. I only recently learned that the PO had put in E cams per Bruce's recommendation (back in '86), but had suspected that I didn't have the S cam. I had been looking for that big punch at 5,500+
I'm just considering my options since this is really just a "fun" car and definitely not a DD.

[Grady Clay]

Originally Posted by gsjohnson

Bruce Anderson also states that the S piston/E cam combo gives up some low end driveability. He scared me with that statement so I stayed with the E pistons. And with todays gas, I was also worried about the higher S compression. I also went with the DC30 Mod Solex cams.

BOLD emphasis mine.

Excatly where does Bruce say this?

Best,
Grady

[gsjohnson]

Originally Posted by Grady Clay

BOLD emphasis mine.

Excatly where does Bruce say this?

Best,
Grady

Grady-Sorry about that...Wrong author. It was actually Wayne on page 112, first sentence of his "How to Rebuild and Modify Porsche 911 Engines" who says that. I knew I had read it somwhere.

[safe]

I have only driven one E-car, a -72 2.4 E, maybe that engine wasn't set up correctly, but I found it a bit boring... A nice S on the other hand is a hoot to drive.

[gsjohnson]

I always thought my 72 2.4 T was a dog. My 68 2.0 911 was a lot quicker.