[V8] Cams -- again

Tue Mar 20 23:12:49 EDT 2007

I'll share My info.  I have been talking to a cam regrind in regards to 
the most the 3.6L engine and early 4.2L engine can take.  The biggest 
hindrance to a huge cam in the PT/ABH is the lack of cam lobe 
clearance.   If you can get the head machined for larger lobes your 
golden, but otherwise your in trouble.  IIRC the largest lobe was 10mm 
of lift with stock base circles.  You can run a hair more, but your in 
tight clearances and you could have contact if something gets loose.  I 
am working with my source on some truly radical cams in 276/272 duration 
(intake/exhaust) that will fit the stock head.  The issue then is that 
the cam will be ground so much I'll be through the heat treated portion 
so I'll need a nitrate cycle to harden them back to spec.  The price on 
this is not known yet as I have to figure out if new valves are needed 
or I can get away with adding some stem cap shims to raise the lifter 
back up.  You can grind ~1mm off the base circle of the cam before the 
hydraulic lifters are out of range and you get gaps which means you 
don't get the cams lift or duration numbers.

The biggest thing with regrinds is the starting point about 255 is the 
most you can get out of the stock PT intake cam.  You can get to ~265 on 
the exhaust, but why bother with a large exhaust in these motors?  The 
276 cams I am working on are going to use stock PT blanks and have the 
base circles cut to remove weight and material.  The draw back is the 
need for longer valves or to shim the lifters up to get them in the 
range of working.  I am not saying it's a good mild cam for those 
running stock ecu's as it will require a chip tune min as  you'll flow 
allot more air.  I'll keep those interested informed.  If interested 
please reply to spcole at mn.rr.com.

Sean

>Message: 8
>Date: Tue, 20 Mar 2007 17:20:33 -0400
>From: "Coleman, David" <David.Coleman at blackrock.com>
>Subject: Re: [V8] Cams -- again
>To: "Ron Wainwright" <ron_01056 at yahoo.com>
>Cc: V8 Fans <v8 at audifans.com>
>Message-ID:
>	<F08F294EDC8BDF40BBFED1FA42CE3D7E02370946 at DELPEXV003.na.blkint.com>
>Content-Type: text/plain; charset=us-ascii
>
>I was about *that* close to buying a 944 turbo yesterday, but then
>figured, hell, that can (and should) wait... I want my V8 to be where I
>want it first -- including something around or a tad north of 300HP, but
>without turbos and all the engine management hoopla that goes along with
>them...  So now that it's somewhat not freezing outside, I'd better get
>moving forward... I'm thinking top and bottom end rebuild, and upgrade
>the cams.
>
>I have the feeling that a "group buy" approach for this won't work.
>It's rare for anyone to be on this page at the same time as someone else
>-- and since this isn't the Radical Civic list, this isn't even on most
>people's collective radar screen...
>
>My main concern is that some space-age polymer finish isn't there to be
>stripped from the lobes, leading to a kablooie situation.  Otherwise:
>
>Do we know the current cam specs, as well as an idea of what we'd have
>them reshaped to?
>
>And what's the opportunity for big valves?  Intake, exhaust, both,
>neither?
>
>Yes, swapping to an ABZ or whatever would be great too, but until
>there's credible feedback from someone who's done such a swap, I don't
>want to be the guinea pig (let alone go the whole summer with my car's
>guts spilled all over the garage floor).
>
>-dc-
>
>  
>
>>-----Original Message-----
>>From: Ron Wainwright [mailto:ron_01056 at yahoo.com] 
>>Sent: Tuesday, March 20, 2007 5:05 PM
>>To: Coleman, David
>>Cc: v8 at audifans.com
>>Subject: Re: [V8] Cams -- again
>>
>>Dave, et all.....I kinda haven't followed up on this huh.
>>But if there's sufficiant intrest in cam regrinds, & or 
>>additional parts, etc..I can get the ball rolling again :-)
>>
>> If say 5 listers were interested I could get some updated 
>>prices on the additional bits that were mentioned by myself 
>>before X-Ma$$. But suffic it to say cam regrinds are bout 
>>$900..so who wants to spend some $$$??
>>
>> Thanx
>>Ron
>>
>>--- "Coleman, David" <David.Coleman at blackrock.com>
>>wrote:
>>
>>    
>>
>>>Does anyone have any experience with Web Cam, Inc.?
>>>
>>>If I were to pull my four cams out and send them for lobe 
>>>      
>>>
>>welding and 
>>    
>>
>>>grinding, what specific issues or concerns should I make 
>>>      
>>>
>>sure are good 
>>    
>>
>>>to go?
>>>
>>>I'm digging through all the previous posts from Ron, et.al. that I 
>>>saved, but wanted to run this up again.
>>>
>>>-DaveC.
>>>
>>>THE INFORMATION CONTAINED IN THIS MESSAGE AND ANY ATTACHMENT MAY BE 
>>>PRIVILEGED, CONFIDENTIAL, PROPRIETARY OR OTHERWISE PROTECTED FROM 
>>>DISCLOSURE.
>>>If the reader of this message is not the intended 
>>>      
>>>
>>recipient, you are 
>>    
>>
>>>hereby notified that any dissemination, distribution, 
>>>      
>>>
>>copying or use 
>>    
>>
>>>of this message and any attachment is strictly prohibited.
>>>If you have received this message in error, please notify us 
>>>immediately by replying to the message and permanently 
>>>      
>>>
>>delete it from 
>>    
>>
>>>your computer and destroy any printout thereof.
>>>_______________________________________________
>>>Audifans V8 mailing list
>>>Send posts to: mailto:V8 at audifans.com
>>>Manage your list connection:
>>>http://www.audifans.com/mailman/listinfo/v8
>>>Have an Audi V8 question?  Check the Audifans Knowledgebase!
>>>http://www.audifans.com/twiki/bin/view/Audi/V8
>>>Have a V8 answer? ... Please help others by adding to the 
>>>      
>>>
>>KB ... all 
>>    
>>
>>>contributions welcome!
>>>
>>>      
>>>
>>
>> 
>>______________________________________________________________
>>______________________
>>Looking for earth-friendly autos? 
>>Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center.
>>http://autos.yahoo.com/green_center/
>>
>>    
>>
>
>THE INFORMATION CONTAINED IN THIS MESSAGE AND ANY ATTACHMENT MAY BE PRIVILEGED, CONFIDENTIAL, PROPRIETARY OR OTHERWISE PROTECTED FROM DISCLOSURE. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution, copying or use of this message and any attachment is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and permanently delete it from your computer and destroy any printout thereof.
>
>
>------------------------------
>
>_______________________________________________
>Audifans V8 mailing list digest
>Send posts to: mailto:V8 at audifans.com
>Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
>Have an Audi V8 question?  Check the Audifans Knowledgebase!
>http://www.audifans.com/twiki/bin/view/Audi/V8
>Have a V8 answer? ... Please help others by adding to the KB ... all contributions welcome!
>
>End of V8 Digest, Vol 41, Issue 43
>**********************************
>
>
>  
>