1007 Seeley Commando dyno run

Nigel,
Could you tell us what are the main advantages of the Seeley frame? I have read about them for years that they are the best for racing with an excellent reputation.
Thanks,
Mike
 
YING said:
Nigel,
Could you tell us what are the main advantages of the Seeley frame? I have read about them for years that they are the best for racing with an excellent reputation.
Thanks,
Mike
Click to expand...
A Seeley chassis when all said and done is a lot lighter. The steering is super precise. I’m not saying other chassis can’t be made good though!
 
I can tell you the advantages of a Seeley frame. I raced my 500cc Triton against my mate who had a 650cc Triton at many race meetings. His bike was faster down the straights, but I could beat him around any corner - se we were always neck and neck battling it out. One day there was a meeting where he was riding another friend's Seeley Laverda 750. After about four laps, I blew him off down a straight. As we reached the corner I was in front of him and when I braked, the drum really stopped the bike too quick - the linings had heated-up. He rode around the outside of me in the corner, popped in front of me, and grabbed a handful of discs. I barely touched the front brake again and the bike went into a lock-to-lock tank slapper and chucked me down the road on the top of my head. What he did was way beyond his normal capabilities - it just could not be done with a featherbed frame. I followed the bike for two years and when I found it, I bought it . But I could not get the motor. I kid you not, that frame combined with TZ350 Yamaha fork yokes gives 106mm of trail with 27 degree rake and 18 inch wheels. With the 850 Norton motor on methanol and close ratio gears, it can beat anything. My problem was, it took me a while to find out how to use it. It does not make sense to accelerate flat-out around corners from beginning to end after braking. It makes me nervous even thinking about it. The Mk3 Seeley frame is lighter and more rigid. The way it handles is absolutely gem. My Seeley 850 is the easiest bike to ride fast of any I have experienced, It is a mindless exercise, as long as I brake before the corners.
 
Fast Eddie said:
There is no point in discussing absolute numbers, dynos are different, dyno operators are different, etc.

What they are good for is getting the carbs set up well and getting clear before and after figures to evaluate changes made.
Click to expand...
So... Nigel I think this translates into: Blah,Blah.......Blah, Blah, Blah....I'm Not Tellin' Ya!:cool: At least that's how I read it :D
 
Last edited:
Fast Eddie said:
A Seeley chassis when all said and done is a lot lighter. The steering is super precise. I’m not saying other chassis can’t be made good though!
Click to expand...
Nigel,
With a Seeley frame, the motor mounted rigidly and then balanced accordingly?
Thanks,Mike
I have never seen one in person.
 
YING said:
Nigel,
Could you tell us what are the main advantages of the Seeley frame? I have read about them for years that they are the best for racing with an excellent reputation.
Thanks,
Mike
Click to expand...
They are lighter than even a stripped down Commando, and go where you point them.

Despite what a certain regular poster here says, they have neutral handling and a bit of flex. They also seem to work regardless of engine type installed.

FEs is a MK2 replica, I have ridden a Caffrey framed 750 long stroke MkIV. i'm not sure they differ by much when it counts, but I have noted that original Seeley MkIII frames had a tendency to crack around the rear engine plate mountings. I'm convinced that Seeleys steer better than my Rickman, making the Seeley best when you want to change your line mid-corner because someone else is where you want to be.

The Rickman really comes into its own on long fast sweeping, and empty, bends. Bends of a type that don't generally feature in tight little French tracks!

Oh Well!
 
Last edited:
acotrel said:
I can tell you the advantages of a Seeley frame. I raced my 500cc Triton against my mate who had a 650cc Triton at many race meetings. His bike was faster down the straights, but I could beat him around any corner - se we were always neck and neck battling it out. One day there was a meeting where he was riding another friend's Seeley Laverda 750. After about four laps, I blew him off down a straight. As we reached the corner I was in front of him and when I braked, the drum really stopped the bike too quick - the linings had heated-up. He rode around the outside of me in the corner, popped in front of me, and grabbed a handful of discs. I barely touched the front brake again and the bike went into a lock-to-lock tank slapper and chucked me down the road on the top of my head. What he did was way beyond his normal capabilities - it just could not be done with a featherbed frame. I followed the bike for two years and when I found it, I bought it . But I could not get the motor. I kid you not, that frame combined with TZ350 Yamaha fork yokes gives 106mm of trail with 27 degree rake and 18 inch wheels. With the 850 Norton motor on methanol and close ratio gears, it can beat anything. My problem was, it took me a while to find out how to use it. It does not make sense to accelerate flat-out around corners from beginning to end after braking. It makes me nervous even thinking about it. The Mk3 Seeley frame is lighter and more rigid. The way it handles is absolutely gem. My Seeley 850 is the easiest bike to ride fast of any I have experienced, It is a mindless exercise, as long as I brake before the corners.
Click to expand...
What were you gear ratios in the box?

Close ratio?

Wide?
 
Yup, gotta agree Jim.

My engine in the video has JS rods and pistons in.

Big saving in reciprocating weight, especially so with such big pistons (83mm bore).
 
jseng1 said:
This is why its so important to use lightweight pistons. Heavy pistons will shake your brains out - crack and break things. I had plenty of experience with that when I was racing before I lightened things up.
Click to expand...

The way the heck lighter crank in the 1007 probably doesn't hurt either.

That engine sure sounds strong to me spinning the rollers on the dyno.

Do it again with the new tune please. 👍
 
SteveA said:
They are lighter than even a stripped down Commando, and go where you point them.

Despite what a certain regular poster here says, they have neutral handling and a bit of flex. They also seem to work regardless of engine type installed.

FEs is a MK2 replica, I have ridden a Caffrey framed 750 long stroke MkIV. i'm not sure they differ by much when it counts, but I have noted that original Seeley MkIII frames had a tendency to crack around the rear engine plate mountings. I'm convinced that Seeleys steer better than my Rickman, making the Seeley best when you want to change your line mid-corner because someone else is where you want to be.

The Rickman really comes into its own on long fast sweeping, and empty, bends. Bends of a type that don't generally feature in tight little French tracks!

Oh Well!
Click to expand...
I sense a session at Spa is called for :-)
 

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