Topica Loopframe_Guzzi Archive
 

Subject: RE: What heads to use!

Author: Edward Walton

Date: Jan 30, 2005, 9:06 PM

Post ID: 1718303408


<html><div style='background-color:'><DIV class=RTE>
<P>Thanks Charlie, I will look for the Nut thats needed.</P>
<P>No need to post pictures, found a 850 head to look at today.</P>
<P>Cheers TED <BR><BR></P></DIV>
<DIV></DIV>From: Charlie Mullendore <c.d.mul-@att.net>
<DIV></DIV>Reply-To: Loopfram-@topica.com
<DIV></DIV>To: Loopfram-@topica.com
<DIV></DIV>Subject: RE: What heads to use!
<DIV></DIV>Date: Fri, 28 Jan 2005 23:41:39 +0000
<DIV></DIV>
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<DIV></DIV>Hi Ted,
<DIV></DIV>As Paul said, both valves are larger on the later heads. There is a
<DIV></DIV>raised area around the valve guide that is part of the casting - this
<DIV></DIV>would have to be machined down to match the later heads if you wanted to
<DIV></DIV>use dual springs. Instead of doing this though, I'd either just use the
<DIV></DIV>heads as they are with single springs and small valves (IMHO, the early
<DIV></DIV>Ambos with these heads run plenty strong) or find a pair of later heads.
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>One other thing that is different is the way they are secured to the
<DIV></DIV>cylinder studs. Instead of a nut with an "allen" head under the hex plug
<DIV></DIV>at the 12 o'clock position on the later heads, there is a bolt/nut
<DIV></DIV>thingy (hex head, approx. 3" long, o-ring groove) on the V700/early Ambo
<DIV></DIV>heads. You'll need these if you're going to use the early heads.
<DIV></DIV>
<DIV></DIV>I can post some pics of the two heads side by side for comparison if
<DIV></DIV>you'd like. Cheers,
<DIV></DIV>
<DIV></DIV>Paul P. Linn wrote:
<DIV></DIV>> Ted,
<DIV></DIV>>
<DIV></DIV>> As Charlie said, the valves on later models like the 850 are bigger,
<DIV></DIV>> they
<DIV></DIV>> will not fit the V700 heads. Some of the early 750's used the same heads
<DIV></DIV>> and
<DIV></DIV>> valves as the V700. Rather than machine a good set of V700 heads, look
<DIV></DIV>> around for some later model ones. Plenty up on eBay all the time.
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>> From: edward Walton
<DIV></DIV>
<DIV></DIV>> Charlie
<DIV></DIV>>
<DIV></DIV>> Fifteen years ago I changed the heads on my Ambassador, Header pipes
<DIV></DIV>> were
<DIV></DIV>> moving arround Threads were toast! Put on new heads and kept the
<DIV></DIV>> valves.These old valves fitted into the V700 heads! Is that right? Will
<DIV></DIV>> 850
<DIV></DIV>> eldo & 850 t valves fit or are they bigger? For sure the twin springs
<DIV></DIV>> will
<DIV></DIV>> not fit over the vavle guides. Guides have to be changed so should I
<DIV></DIV>> machine
<DIV></DIV>> the heads to fit the dual springs or just leave the singles? Thanks for
<DIV></DIV>> the
<DIV></DIV>> help Guy`s
<DIV></DIV>>
<DIV></DIV>> Ted
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>> From: Charlie Mullendore
<DIV></DIV>
<DIV></DIV>> Hi Ted,
<DIV></DIV>> I wouldn't think there would be a problem with the single valve springs
<DIV></DIV>> unless it was with float at high RPMs. The V700/early Ambo heads also
<DIV></DIV>> have smaller valve diameters so you'll not get the horsepower of the
<DIV></DIV>> later heads. They use a different guide as well, but the later style
<DIV></DIV>> will work without the locating circlip or ridge. One plus that I've
<DIV></DIV>> noticed though is that the V700 heads don't seem to crack between the
<DIV></DIV>> (intake or exhaust? - can't remember right now) valve and sparkplug hole
<DIV></DIV>>
<DIV></DIV>> like most of the later heads do. If you use them I'd recommend using the
<DIV></DIV>>
<DIV></DIV>> reducer inserts sandwiched between two gaskets for proper port velocity
<DIV></DIV>> and heat isolation.
<DIV></DIV>
<DIV></DIV>> Edward Walton wrote:
<DIV></DIV>> >
<DIV></DIV>> > Hey Guys I have a old set of heads that came off a 700 or 750 with the
<DIV></DIV>> > metal inserts for intake side. When you have the inserts out the intake
<DIV></DIV>> > hole is too big for the newer square sided carbs. Are these heads as
<DIV></DIV>> > good as the others. Looks like the dual springs will not fit . They have
<DIV></DIV>> >
<DIV></DIV>> > good exhaust threads! Any problems with the single spring valves.
<DIV></DIV>> > Thanks Ted
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>Charlie
<DIV></DIV>http://www.loopframeguzzi.com/
<DIV></DIV>
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