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Feb 4th, 2010, 10:07 pm
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#1 (permalink)
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Senior Member
Join Date: May 2007
Location: seattle, washington, USA
Posts: 463
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big valve heads...
Just got some 1998 916 heads from webman for my 853 that is being put together and I measured the valves with a surprise. Are the 916 valves really 33 intake and 31mm exhaust? I thought it was more like 30/31. If so I am happy and with the 916 throttle bodies, 50mm pipes and the pc3... I should Hit my goal! Any info is much appreciated.
Thanks
Blake
__________________
2001 748s (999 motor) 
2006 999 (sold)
1995 rvf400 (sold)
1998 750 (sold)
2006 R6 (sold)
2001 RSVR (sold)
2000 996sps (sold)
2006 GSXR 600 (sold)
1999 tl1000s (sold)
1969 cb350 cafe (sold)
748 mods
Always changing
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Feb 4th, 2010, 10:53 pm
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#2 (permalink)
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Banned
Join Date: Dec 2006
Location: The lovely Van Nuys, California, USA
Posts: 11,278
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The stock 916 is pretty dam small 33/29.
The factory bikes were 37/31 in the 916 and 39/32 in the 996
I don't see any heads that were 33/31, so thats something your mechanic must have come up with on his own.
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Feb 5th, 2010, 12:08 am
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#3 (permalink)
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Senior Member
Join Date: May 2007
Location: seattle, washington, USA
Posts: 463
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ok
Your funny Tye,
Not all of us have mechanics! Jk. Actually they are the big valve 916 heads and I was just confirming the the measurements I took. They were 33.75mm intake exactly and and 31.10 exhaust. I am just making sure this is correct as I thought they were different.
__________________
2001 748s (999 motor)
2006 999 (sold)
1995 rvf400 (sold)
1998 750 (sold)
2006 R6 (sold)
2001 RSVR (sold)
2000 996sps (sold)
2006 GSXR 600 (sold)
1999 tl1000s (sold)
1969 cb350 cafe (sold)
748 mods
Always changing
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Feb 5th, 2010, 12:50 am
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#4 (permalink)
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Moderator
Join Date: May 2004
Location: Newcastle, NSW, Australia
Posts: 401
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Way to go Tye, you know all the specs. Regardless of what the guy measures.
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Feb 5th, 2010, 1:08 am
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#5 (permalink)
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Banned
Join Date: Dec 2006
Location: The lovely Van Nuys, California, USA
Posts: 11,278
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Quote:
Originally Posted by jwsparkes
Way to go Tye, you know all the specs. Regardless of what the guy measures.
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Na, don't give me credit, I've got a book right here on my shelf which has ALL the desmoquattro specs in it. 
You'd be amazed at how many renditions Ducati made to that head.
The 748R had the largest valves in the street production desmoquattro run, which is interesting.
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Feb 5th, 2010, 1:31 am
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#6 (permalink)
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Senior Member
Join Date: May 2007
Location: seattle, washington, USA
Posts: 463
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so... what is the closest measurement you have in your little book... am I measuring wrong? Valve head distance on the chamber side right?
__________________
2001 748s (999 motor)
2006 999 (sold)
1995 rvf400 (sold)
1998 750 (sold)
2006 R6 (sold)
2001 RSVR (sold)
2000 996sps (sold)
2006 GSXR 600 (sold)
1999 tl1000s (sold)
1969 cb350 cafe (sold)
748 mods
Always changing
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Feb 5th, 2010, 1:44 am
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#7 (permalink)
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Banned
Join Date: Dec 2006
Location: The lovely Van Nuys, California, USA
Posts: 11,278
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Quote:
Originally Posted by duc_duc
so... what is the closest measurement you have in your little book... am I measuring wrong? Valve head distance on the chamber side right?
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33/29 is what those valves "should" be. So the exhausts are 31's instead of 29's...
I just stick a set of calipers on the valve itself. I'm about to fall a sleep, or I'd go down stairs, grab my calipers and some valves and measure a few for ya ( have stock 916 heads in my garage right now!  I actually don't do much valve measuring, so I don't know how far off Ducati's specs are vs the manufacturer who builds the valves.
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Feb 5th, 2010, 5:27 am
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#8 (permalink)
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The Finder
Join Date: Mar 2009
Location: Chicago, IL, USA
Posts: 3,010
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Tye is correct, and when he says "factory", that refers to the race bikes.
Here is a photo of a set of 34/30mm heads--not from an actual 916SP, but the same size used on the SP's. Just measure as seen here:
__________________
2001 Ducati 996 R
2001 Ducati 996 track bike
1971 Honda CB450 cafe racer
1989 Honda NSR250 MC18/derestricted
2001 Derbi GPR 75
1998 Ducati 916 SPS #909(sold)
2000 Ducati 996 SPS #1134(sold)
1999 Laverda Formula 750S(sold)
2001 Ducati 996 Monoposto(sold)
1998 Ducati 748 (sold)
1999 Ducati Monster 900 (sold)
1995 Ducati 916 (sold)
1997 Suzuki TL1000s (sold)
1994 Honda VFR750 (sold)
1988 Yamaha FZR1000 (sold)
1990 Suzuki Katana 600 (sold)
1986 Yamaha Radian 600 (sold)
1985 Kawasaki GPz750 (sold)
1983 Suzuki GS450E (sold)
Last edited by nine16; Feb 5th, 2010 at 1:58 pm.
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Feb 6th, 2010, 12:18 am
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#9 (permalink)
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Senior Member
Join Date: Oct 2006
Posts: 513
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Stock 748/916 valves (boo)
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M1100
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Feb 6th, 2010, 12:19 am
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#10 (permalink)
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Senior Member
Join Date: Oct 2006
Posts: 513
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Oversized valves (yay)
35/30 if I recall...
Dunno what your goal is, but if it's more smiles per mile, the 853 will deliver.
__________________
M1100
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