chain tensioner

[stevenmichelsen2]

Is a chain tensioner w/sprocket for a 600 still available? If not
I'm thinking of building one. Comments anyone? Thanks, Bill

[Steve]

Don't use acetal plastic aka trade name Delrin. It tends to melt
under high heat. I can email you an ugly picture of a guide roller
made from acetal. The original ones were some type of super duper
rubber that withstood the heat and oil. A friend made one from brass,
but it seems to me it would break down and mess up the engine plus it
would be incredibly heavy. There is a plastic called either PEET or
PEEK that is high temp and durable but costs like a million dollars a
foot. Teflon is temp resistant, but not wear resistant.
Miles

[dealadayray]

Hi Bill;
The rubber is a compound and by talking to the right people you can find a
match for what Honda produced. Call Stillman Seal Division XXX-XXX-XXXX,
the area code may have changed since I called them last. But they offered
to do center cam chain rollers. using the original metal centers. Miles is
correct, the plastics don't seem to hold up. I had the rubber dampers for
the sprockets made up with a special compound to bring it up to 80 shore (a
hardness range determined by a Shore Durometer). They do very well and none
have broken up like I have seen the ones Honda made do. Stock compounds can
be used some of which have a Tensile Strength of over 2000psi. But also
look at Polyurethane (millable grade) it may be a way to get away from
casting.
Good Luck
Bill Colford

[Neil]

What about using something like 2024 or 7075 aluminum alloy. Good
toughness and tensile strength without being too heavy. I think cam
rollers have been made out of aluminum for hipo Honda CB350 m/c
engines and probably others.

[eholman]

Neil,
You're correct the racers use a custom made roller out of 7075 aluminum.
There's a man in Madison, Indiana that came up with a slipper system for the
CB350 engines. Might be he'd do the same for the 600's. If anyone would like
to contact him, his name is Ken Miller, klmiller@...
Cheers!
Ellis
Neil wrote:

> What about using something like 2024 or 7075 aluminum alloy. Good
> toughness and tensile strength without being too heavy. I think cam
> rollers have been made out of aluminum for hipo Honda CB350 m/c
> engines and probably others.
> --- In
2cylinderhondas@yahoogroups.com
, "william colford"
> wrote:
> > Hi Bill;
> > The rubber is a compound and by talking to the right people
> you can find a
> > match for what Honda produced. Call Stillman Seal Division 619 438-
> 1011,
> > the area code may have changed since I called them last. But they
> offered
> > to do center cam chain rollers. using the original metal centers.
> Miles is
> > correct, the plastics don't seem to hold up. I had the rubber
> dampers for
> > the sprockets made up with a special compound to bring it up to 80
> shore (a
> > hardness range determined by a Shore Durometer). They do very well
> and none
> > have broken up like I have seen the ones Honda made do. Stock
> compounds can
> > be used some of which have a Tensile Strength of over 2000psi. But
> also
> > look at Polyurethane (millable grade) it may be a way to get away
> from
> > casting.
> > Good Luck
> > Bill Colford
> > -----Original Message-----
> > From: billranney1952 [mailto:bivv@m...]
> > Sent: Friday, September 03, 2004 7:09 PM
> > To:
2cylinderhondas@yahoogroups.com
> > Subject: [2cylinderhondas] chain tensioner
> > Is a chain tensioner w/sprocket for a 600 still available? If not
> > I'm thinking of building one. Comments anyone? Thanks, Bill

[dealadayray]

Hi Neil;
here again, metal against metal, you will distroy your engine.
Bill