Engine -transmission bolt patterns, Type I ,IV & Porsche 2.0-3.2 the same ? Options

[jeff]

Good morning, I’m wondering if the bolt pattern for a type I, type IV & Porsche 2.0-3.2 or even 3.6 are the same? I’m looking at an adapter plate for a Type I and I’m wondering if it could work with a Porsche -6. I suppose I’d need to have a custom flywheel/ clutch setup .

[mepstein]

Type 4 and all H6’s are the same. No idea about T1 but I know people use T1’s in their 912’s so I wouldn’t be surprised if it’s the same or very similar.

[porschetub]

Type 4 and all H6’s are the same. No idea about T1 but I know people use T1’s in their 912’s so I wouldn’t be surprised if it’s the same or very similar.

I had a bus 1.8 T4 bolted to a T1 box in my plastic Speedster ,cheers.

[Jack Standz]

Gonna say no or not easily. So, to answer your question, not the same.

2.4 and 2.7 Porsche motors are 6 bolt patterns and 3.0 to 3.8 are 9 bolt.

Maybe try KEP?

[ClayPerrine]

The bellhousing bolt pattern for VW and Porsche air cooled motors are all the same. You can bolt a Beetle bell housing to a 3.6L 911 motor.

The clutches and flywheels are different.

The VW and 356 use almost the same clutch setup, IIRC a 200mm clutch disk and pressure plate.

The 65 through 69 911 and all 914s use the same 215MM clutch and push type pressure plate setup. The only differences is the 914-4 uses a 5 bolt flywheel, and the 911 uses a 6 bolt flywheel. The flywheel dimensions are the same, the only difference is the bolt pattern.

In 1970 and 1971, the 911 used a 225mm clutch and pull type pressure plate. Other than the clutch, the rest of the transmission parts were unchanged from the 69 911.

That same clutch setup stayed the same through 95. With the introduction of the 911 SC, the flywheel went from 6 bolts to 9 bolts and stayed that way though the end of the air cooled run. The 915 transmission could be used in a 914, but you have to flip the ring gear, and get a vellios or Martin Bott kit to make it work.

With the 964 and 993, they went to a 240mm clutch disk, and a G50 transmission, none of which is compatible with a 914 without fabrication or purchase of a special flywheel from someplace like Kennedy engineering. And a 901 behind a 3.6 is a grenade with the pin pulled. Sir Andy has to baby his to keep it from exploding.

And the only way to use a G50 transmission in a 914 is to flip it upside down. And that brings a host of other problems. The bellhousing bolt pattern is not symmetrical top to bottom, so you have to redrill the holes. And you have to plug the vent and put one in the top. Then you have to make a motor mount and a way to shift it. And to top it all off you have to cut the bottom out of the rear trunk,and run the axles at insane angles to make it work.

I hope this info helps with any questions about air cooled VW and Porsche clutches and transmissions.

Clay

[mepstein]

Gonna say no or not easily. So, to answer your question, not the same.

2.4 and 2.7 Porsche motors are 6 bolt patterns and 3.0 to 3.8 are 9 bolt.

Maybe try KEP?

6 bolt crank on the early cars, 9 bolt on the later ones. That doesn’t affect the engine to trans pattern. Clay explained the clutch issues but 911/914/915 trans are almost like legos the way they can mix and match.