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-   -   Silly Engine Questions Thread (http://forums.pelicanparts.com/911-engine-rebuilding-forum/408701-silly-engine-questions-thread.html)

wwhalenc 05-11-2008 07:38 AM

Silly Engine Questions Thread
 
oK, let me start. I've got Wayne's book. I see mention of a motor with 2.7 crank in the 3.0 case. Is there any way to use the 3.2 Pistons/cylinders with the 2.7 crank in the 7R case? Could you just shorten the cylinder?

I've read many pages of this forum..no mention. Obvious newbie wonders.

356RS 05-11-2008 08:22 AM

The 3.2 has 95mm piston/cylinders and will not fit the 7R case. The biggest piston size that can be fitted into the 7R case are from LN Engineering and they are 93mm and that's pushing it to the max.

wwhalenc 05-11-2008 01:48 PM

Thank you for the info. Is it more a bolt spacing issue or strength issue?

lindemans 05-11-2008 03:02 PM

It has to do with the size of the hole in the case that the rods stick trough, the round opening between the 4 studs.
You would have to grind them larger but I would not recommend doing that ...

wwhalenc 05-12-2008 11:40 AM

OK... Next question.
 
If that just has to do with spigot size/case strength rather than bolt spacing, then question number two is "Can SC heads be used on smaller bore cylinders?"

dtw 05-12-2008 12:45 PM

No and no. The head stud spacing changed on the SCs and up, so jugs/heads from 3l motors cannot be used on the 2.7 cases, and vice versa.

cnavarro 05-12-2008 06:25 PM

Actually, I'm finishing up a set of cylinders special made with the case register of a 2.7 and head register of a 3.0/3.2, to allow for later heads. The customer is going to modify the heads to fit the 2.7 stud pattern, as it's actually pretty close and quite feasible and not all that expensive to do. It was actually the customer's idea and not a bad one at all!

wwhalenc 05-12-2008 06:31 PM

Let me test a set!
 
Assuming that's a no, on to question III:

I'm obsessed with implementing megasquirt. The plan was to use some 3.2 Intake stuff I've sourced and port the heads to match. Will this kill air velocity? This is not intended to be a track car--just some track days. I realize that there's a lot of other stuff at play here, but is this a very bad idea?

PS: Thanks to the board for entertaining questions from a newbie.

Aurel 05-12-2008 07:53 PM

Here is a silly question for the thread: could one build a 3.3 NA motor from a 3.0 case and 3.3 turbo cylinders with higher compression JE pistons?

Aurel

YTNUKLR 05-13-2008 01:29 AM

Quote:

Originally Posted by Aurel (Post 3938923)
Here is a silly question for the thread: could one build a 3.3 NA motor from a 3.0 case and 3.3 turbo cylinders with higher compression JE pistons?

Aurel

sure

TibetanT 05-13-2008 10:16 PM

I am no expert in this area, but I think the 3.3L engine has the same case as the 3.0L 911SC, right?

So, if this is true...you should be able to do it.


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