|
|
|
|
| Author |
|
|
Registered
Join Date: Aug 2009
Location: Illinois
Posts: 1,653
|
2.2E port options
Got a quick question. I searched and didn't find exactly the answer I was looking for. I'm building essentially a 2.2E motor in a 2.2T case.
I have two head options available. Tried and true 2.2T heads which I know will work but they need valves replaced. I also have a like new set of 2.7S heads (35mm ports) that I could use. I am running webers. What is the effect of a larger port on an E motor like this? Obviously it works well on a more radical motor but will it detract from an E spec motor? Thanks for your help.
__________________
70T 2.7RS spec. 68L coupe |
||
03-08-2014, 08:30 AM
|
|
|
Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
|
Use the 2.2T heads to maintain port velocity using E Cams.
The 2.7 heads would be OK for an S-cammed engine or better.
__________________
Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
||
|
03-08-2014, 12:20 PM
|
|
|
Registered
Join Date: Aug 2009
Location: Illinois
Posts: 1,653
|
Thanks Steve. That's what I was suspecting might be the answer. I was hoping otherwise. My 2.7 heads are like brand new. Looks like I will be sending my 2.2 heads off and selling the 2.7 heads.
__________________
70T 2.7RS spec. 68L coupe |
||
|
03-08-2014, 01:25 PM
|
|
|
Licensed User
Join Date: Feb 2003
Location: ....down Highway 61
Posts: 6,506
|
Sorry to hijack, but is the cam the main factor in the decision on the port size? Would you still choose the stock size ports on the 2.2T heads if you were building something like a 2.5 or 2.7 with the same E cam?
Thanks in advance Last edited by Shuie; 03-09-2014 at 06:28 PM.. |
||
|
03-09-2014, 01:36 PM
|
|
|
Registered
Join Date: Aug 2009
Location: Illinois
Posts: 1,653
|
Ok. Another question. Since I'm going to rework the 2.2T heads anyway, is there any advantage to opening the ports at all? I understand that 35mm is too big but is it worth porting out an extra mm or so?
__________________
70T 2.7RS spec. 68L coupe |
||
|
03-10-2014, 04:57 AM
|
|
|
I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
|
My 2.2T was rebuilt long ago with 2.2E pistons and cams. The heads were not ported. It runs fantastic.
I am a proponent of smaller than larger when it comes to port sizing for anything but an all-out track car. Port velocity helps so much in low-speed performance where most of the time is spent. More gains here with small ports compared to the high-rpm loss from a choking effect.
__________________
Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
||
|
03-12-2014, 07:06 AM
|
|
|
NOS driver
Join Date: Aug 2010
Location: Barcelona, Spain
Posts: 211
|
For the very little experience I've got what I don't get is that even if T heads have got small ports, the valves are still HUGE. So the flow will need to slow down a lot before entering the combustion chambers. If it was possible, wouldn't be better to match the smaller ports with smaller valves?
luca |
||
|
03-12-2014, 01:03 PM
|
|
