Schwany
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- Joined
- Apr 22, 2020
- Messages
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What follows is of no value to people doing P11 restorations unless they want to go way off script. Tuners might find it interesting.
Last time I messed around with my intake manifolds for FCR carburetion on my P11 I made them about 1/8" too long. Getting my K&N air filters on scratched the paint up on the rear down tubes that come down from the main backbone of the frame. Kinda ugly and it made getting the air cleaners on a pain. Anywho, six months later yesterday I took the carburetors and intakes off and cut 1/8" off the length of the manifolds using a hacksaw. I also used a 1/8" shorter length of hose for the spigot attachment between the intake manifolds and the carburetor body. I put it back together and it's a bit easier to start and responds to throttle events extremely well. And if I'm careful I can get the air filters on without scratching anymore paint off the frame. Essentially the length is just right for the squirt from the accelerator pump. Amazing difference. No dyno was used to determine it runs better. It's kind of obvious to me.
I'll shoot a video of some throttle blipping and stick it in this thread later. Give you something to make fun of.
This is what the manifolds sort of looked like before I started hacking on them. And yes that is epoxy holding the extensions on. Epoxy is also on the inside of the manifolds. Very strong attachment as long as I don't hit them with a hammer.
The two rings below are what I cut off of the extensions with a hacksaw. Fortunately I have another head I can bolt the manifolds to in order to hold them in place so I can do the hacking with a hacksaw by hand.
Last time I messed around with my intake manifolds for FCR carburetion on my P11 I made them about 1/8" too long. Getting my K&N air filters on scratched the paint up on the rear down tubes that come down from the main backbone of the frame. Kinda ugly and it made getting the air cleaners on a pain. Anywho, six months later yesterday I took the carburetors and intakes off and cut 1/8" off the length of the manifolds using a hacksaw. I also used a 1/8" shorter length of hose for the spigot attachment between the intake manifolds and the carburetor body. I put it back together and it's a bit easier to start and responds to throttle events extremely well. And if I'm careful I can get the air filters on without scratching anymore paint off the frame. Essentially the length is just right for the squirt from the accelerator pump. Amazing difference. No dyno was used to determine it runs better. It's kind of obvious to me.
I'll shoot a video of some throttle blipping and stick it in this thread later. Give you something to make fun of.
This is what the manifolds sort of looked like before I started hacking on them. And yes that is epoxy holding the extensions on. Epoxy is also on the inside of the manifolds. Very strong attachment as long as I don't hit them with a hammer.
The two rings below are what I cut off of the extensions with a hacksaw. Fortunately I have another head I can bolt the manifolds to in order to hold them in place so I can do the hacking with a hacksaw by hand.
