comp xe270ah cams - Page 3 - MustangForums.com

4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

comp xe270ah cams

Reply

 
 
 
Old 02-17-2010, 10:25 PM
  #21  
tbirdscwd
5th Gear Member
 
tbirdscwd's Avatar
 
Join Date: Sep 2006
Location: CA
Posts: 4,039
Default

I would trust Tim and Andy at MPH over just about anyone when it comes to building modular motors. They built me one helluva nice one
tbirdscwd is offline  
Reply With Quote
Old 02-18-2010, 07:33 AM
  #22  
mrtstang
6th Gear Member
 
mrtstang's Avatar
 
Join Date: Jan 2007
Location: MI
Posts: 5,884
Default

Yeah, MPH was very nice to me, but even they weren't aware of some of these ptv clearance issues that we're talking about here.

Check out Modular Head Shop, and see what i mean. I'm starting to see, more and more, that Nick's findings are being are being realized and supported by others. Even John Tymensky (the man who basically designed the mod motor, and is arguably the best modular engine builder in the country) supports these findings.
mrtstang is offline  
Reply With Quote
Old 02-18-2010, 07:52 AM
  #23  
nickmckinney
3rd Gear Member
 
nickmckinney's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 570
Default

Originally Posted by tbirdscwd View Post
I'm sure Nick knows his stuff. I also know the intake valves are bigger than the exhaust valves. If is that is the case that the intake valves are the problem it just surprises me that the techs at Comp Cams that I dealt with could be so far off in their explanation to me.

On many engines it is the exhaust valve that is the problem, the PI is the only modern inline valve engine I know that has the intake valve 0.1" closer to the piston than the exhaust valve. That 0.1" is a deal breaker and going to an aftermarket valve still leaves it 0.060" closer than the exhaust valve. Both the NPI and SVO head do not have this issue.

IMHO Comp is clueless for the PI head, after 11 years they still spec springs for a PI head with the NPI specs (again 0.1" difference which is huge also on valve springs) You install their recommended 26113 spring in a PI head you might as well leave the stock spring in there as its no different.

Now ask me about good cam specs for a LT1 or LS1 and I am clueless
nickmckinney is offline  
Reply With Quote
Old 02-18-2010, 08:11 AM
  #24  
nickmckinney
3rd Gear Member
 
nickmckinney's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 570
Default

Originally Posted by tbirdscwd View Post
I would trust Tim and Andy at MPH over just about anyone when it comes to building modular motors. They built me one helluva nice one

To be honest I find most shops building nice motors don't even think about it as they are usually replacing the pistons with a forged notched version which solves the problem properly. Its really only the NA stock motor crowd that are hitting the wall which is why the 2V gets a lot of the bad rap (a stock PI motor NA you can only do so much without notching the piston, blown or turbo you can cheat it a bit)
nickmckinney is offline  
Reply With Quote
Old 02-18-2010, 04:13 PM
  #25  
tbirdscwd
5th Gear Member
 
tbirdscwd's Avatar
 
Join Date: Sep 2006
Location: CA
Posts: 4,039
Default

Yeah, I doub't most high end engine builders really do see this as an issue since, like you said, they are almost always going with an aftermarket forged piston anyways.

Last edited by tbirdscwd; 02-18-2010 at 04:13 PM. Reason: sp
tbirdscwd is offline  
Reply With Quote
Old 02-19-2010, 02:16 AM
  #26  
mvr
6th Gear Member
Thread Starter
 
mvr's Avatar
 
Join Date: Feb 2005
Location: Vegas
Posts: 5,361
Default

i guess il talk to the shop im going to go to for the install and see what they say about installing these cams. the shop manager is in the local mustang club, its basically the best shop domestic speed shop in vegas. he has an insane 03 cobra vert, he had his shop do all his motor work.
mvr is offline  
Reply With Quote
Old 02-19-2010, 09:11 AM
  #27  
WannaBeGearHead
Go Texas!!!
 
Join Date: Jul 2009
Location: Lincoln, NE
Posts: 4,607
Default

To help with install costs, Nick at MHS sells matching cam gears. Seems like a good way to save on install costs.
WannaBeGearHead is offline  
Reply With Quote
Reply
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
GimpyHSHS
4.6L (1996-2004 Modular) Mustang
11
03-12-2018 04:16 PM
patchshaffer
Tuner Central
3
10-05-2015 02:24 PM
uedlose
The Racers Bench
4
10-01-2015 08:31 PM
Florida Regional Chapter
0
09-30-2015 08:04 PM
junior04
4.6L (1996-2004 Modular) Mustang
1
09-28-2015 10:53 AM

Forum Jump

Thread Tools
Search this Thread
Advertising
Featured Sponsors
Vendor Directory