twin plugging question

Ken911 · 03-19-2011, 11:59 AM

when i pull the trigger on efi soon i have a question about twin plugging the motor i was planning on getting the lower valve covers drilled or finding a set already done. Should i just get a set of 964 lower valve covers will they work? or do they leak or something like that.

TimT · 03-19-2011, 01:23 PM

Get your exiting lower covers machined, while you are having the heads done..

Ken911 · 02:20 PM

yeah well a set of 964 valve covers costs about the same as getting the other machined and I already have a spare set of heads any way was planning on getting a spare set of valve covers also to minimize down time. so will they fit? what i was planning on doing was stocking up on all the parts as i could afford them. getting all the custom machine work done in advance so when i drop the motor I just check every thing and replace the stuff I already know will need work. Any unanticipated / unexpected things that show up will have to be solved then but it will be apart a few weeks not several months.

911TT33 · 03-19-2011, 04:07 PM

I don't believe the 964 ones fit properly. Best to machine your existing ones.

turbo nut · 03-19-2011, 07:14 PM

I just drilled out the 6mm stud holes to 8mm. I really like the o-ring style gasket.

Ken911 · 03-20-2011, 07:22 AM

so the holes are different sizes? or are the studs different?

WERK I · WERK I's Garage

Quote:

Originally Posted by 911TT33

I don't believe the 964 ones fit properly. Best to machine your existing ones.

+1
I think the valve cover stud alignment is different on the 964 cover versus the 930.
There is a picture of both covers in Bruce Anderson's latest Porsche 911 Performance Handbook 3rd Edition on page 105.

Ken911 · 03-20-2011, 08:54 AM

i only have the second addition one

WERK I · WERK I's Garage

Here ya' go....

Ken911 · 03-20-2011, 12:04 PM

yeah the holes look like they are in the same place as well they should be since the 930 and 964 cam towers are identical. so the holes are just smaller then?

WERK I · WERK I's Garage

Still inconclusive. The 964 photos above show the intake covers, while the 930 turbo covers are for the exhaust side.

I seem to recall the 964 cam towers are different than more common "901" cam towers. Contact Steve Weiner at Rennsport. He would know right away.

Ken911 · 03-20-2011, 12:39 PM

i am pretty sure the casting numbers on mine start with 964 not 901

WERK I · WERK I's Garage

You're right 930 instead of 901. Early cam towers to '77 were 901's.

turbo nut · 03-20-2011, 02:28 PM

I,m using 964 covers on 3.3 cam housings just need to make the stud holes larger. I,m also using the latest VW coil on plug and they fit realy well.

Ken911 · 03-21-2011, 05:08 AM

[QUOTE=turbo nut;5913234]I,m using 964 covers on 3.3 cam housings just need to make the stud holes larger. I,m also using the latest VW coil on plug and they fit realy well. Ok cool then thats what i'll do for my twin plug set up

sjf911 · sjf911's Garage

Quote:

Originally Posted by turbo nut

I,m using 964 covers on 3.3 cam housings just need to make the stud holes larger. I,m also using the latest VW coil on plug and they fit realy well.

Very nice. Which specific coils are these and how are you anchoring them?

turbo nut · 03-21-2011, 07:42 AM

2001 1.8T. I think the latest are rev. D . I bought 14 of them through the dealer with a discount they well under $20. They have a rubber piece that fits tight like the 964 wires. I don't use a hold down.

turbo nut · 03-21-2011, 07:44 AM

Should also note plugs with a 5/8 wrench size need to be used.

Ken911 · 03-21-2011, 10:43 AM

Nice!!been wondering about this setup instead of two 6 plug coil packs

KobaltBlau · 03-21-2011, 11:00 AM

Thanks turbo nut. Any more details on your motor (maybe there's another thread?) Looks interesting!