[V8] cam clearence- big cams vs-heads

[sdewitt at stx.rr.com]

Didn't Audi profess to have a way to modify a V8 crank making it a flat crank?

----- Original Message ----- 
From: Tony and Lillie <tonyandlillie1 at earthlink.net> 
Date: Wednesday, March 21, 2007 2:10 pm 
Subject: Re: [V8] cam clearence- big cams vs-heads 
To: J123fs at aol.com, v8 at audifans.com 

> <SNIP> 
> > All the VW racers I know (including myself) do not pay for 
> "machining" we 
> > just clean the edge up with a high speed dremel or die 
> grinder......no 
> > fancy 
> > machining required! 
> > As the V8 heads are the same as the 16 V VW motors I can say 
> with 
> > certainty 
> > that very little needs to be clearanced with larger cam lobes- 
> just a 
> > couple 
> > MM's.....pretty straightforward.....though it should be done 
> prior to 
> > doing 
> > the valve work (you are going to port and change seals- valve 
> job 
> > right?), so 
> > you can hot tank and clean any fillings out. 
> > Jack 
> <SNIP> 
> 
> Well, not exactly the same. But, the bore spacing, valve angles, 
> etc are the 
> same. Everything important with respect to the larger cams, 
> anyhow. So, how 
> large of cams can you put on the VW motors. And, more importantly, 
> what's 
> the timing spec on those cams. Another thing to consider is what 
> the lobe 
> center is. As there is much more of a market for VW 16V cams, I'd 
> say they 
> grind new ones with the same specs as stock, other than lift and 
> duration. 
> As for VW cams directly in a V8 (to answer Dave's question) the 
> firing order 
> is significantly different in a V8Q than VW 4-cyl. Running 4-cyl 
> cams, you 
> would in essance have a "flat" 8-cyl, much like a Ferarri. That's 
> what Audi 
> did with the DTM ,cars, but I doubt you are going to get one of 
> those cranks 
> for cheap ;-) 
> 
> Tony Hoffman 
> 
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