Cylinders

[Wally]

Originally Posted by 70Turbobug

The 3.6 Liter has a 102mm bore.

Oh dear...

3.6 ltr aircooled 911 has 100mm bore, 3.8ltr had 102mm bore

elementary, my dear Watson! LOL.

[70Turbobug]

Oh..ok I must have seen the oversize piston then.I thought it had the same bore as the 3.8 - my bad. Right you are Mr. Holmes

[effvee]

I saw the cylinders today, man looks nice. I sure better get some air over them, they have 21 fins. I sure need to make sure the 11 blade fan is up to it.

[effvee]

Hi everyone, question, at the bottom of the Cylinder where it goes into the spigot. I have noted some cylinders having a machining out a dish like shape. What is the removal of metal for? These are not my cylinder that I am having made, but very close to them. My fins will have the same diameter the entire lenght.

[effvee]

Hi, well the machinst finished them. I told him to only machine one of the four cylinder with the clearence for number 3 cylinder, well he did all four the same way


these are for my 88 stroke engine
************************************************** ***************************

see the machining at the spigot end? is this madatory?
I will have Costa Mesa R&D finish hone to spec's i'll select a 12Ra and cyro treat them before I send them to U.S. Chrome.
See the botom of the cylinder, should'nt I have a cutout for the counter weight to pass by?

[Wally]

Nice! I don't think a cut-out is neccesary when the spigot depth in the case is equal or less then that part of the cylinder.
AFAIK, the spigots are normally there for a little smoother internal case breathing when the piston comes down.

What alu type did you end up with?

[effvee]

Originally Posted by Wally

Nice! I don't think a cut-out is neccesary when the spigot depth in the case is equal or less then that part of the cylinder.
AFAIK, the spigots are normally there for a little smoother internal case breathing when the piston comes down.

What alu type did you end up with?

Extruded 6061 T-6 certified. Walter, finding 4032 ect was not possible, the 700 series and 2000 series will not take the coating. I asked and asked, and then I went to LN site and someone had 200,000.00 mile on LN early version of cylinder. If I remember correctly LN did use 6061 at first. Hay no one was able to tell me of a better on hand Aluminum. If it holds it shape, I'm sure the Nikisal will do its part. Walter I'm not sure if I'm going to use your shroud or just make some runners from my 11 blade directly to each of the cylinders. I plan to have my machinst friend make me some tubes for each of the cylinder and create opening for the runner air from the 11 blade and larger exits on the bottom, and be done with it.

[effvee]

Hi, well I went to my storage unit today. I just had to see how the cylinders looked moked up. I could get use to seeing that coming together, and it being my

I thought that only the #3 cylinder would need the releif cutout, but by my fins being the same diamter all the way down; it would seem that the #2 cylinder releif was a good thing there to

[70Turbobug]

They look great Francelle! Excellent machining and design! I´m really anxiuos to see how they will hold up! Good Luck and keep us posted!

[NO_H2O]

Nice looking jugs. Never thought I would say that to a guy.

[effvee]

Originally Posted by NO_H2O

Nice looking jugs. Never thought I would say that to a guy.

Ha,ha, and ha

[effvee]

Originally Posted by Wally

Nice! I don't think a cut-out is neccesary when the spigot depth in the case is equal or less then that part of the cylinder.
AFAIK, the spigots are normally there for a little smoother internal case breathing when the piston comes down.

What alu type did you end up with?

Hay Walter, I've been thinking; since I have two set of heads. I think I'll try your shroud, I also have two 11 blade fans and fan rings. Walter may I ask you to look back on you days when you were developing that shroud. What area do you think could stand any kind of attention? I noted the area around the head and spark plug area you were addressing. The sheet metal when it arrived was loose. Does it simply need re-securing? Was there any alt air deflector on the alt for better air direction? Any suggestion?

[Wally]

Yeah, of course, resecuring sounds very logical to do ;-) I used an original porsche deflector on the 11-blade but on your shroud I used an original 12-blade fan housing as you may remember. The 12-blade fans housings have much more internal vanes, so no extra sheet metal vanes were used with the 12-blade fan set-up. The original black plastic ring to cover the alternator on the back of the 12-blade fan set-up was also used.
Look sgreat so far. Good luck!