Dave Sundquist Nortons (2018)

personally I could not live with the way that God awful seat fits the tank! And the style of back end
The exhaust system is pointless etc etc
The finish is superb and a very interesting bike

That's my impression also. The tank and seat don't look good to me, nor the exhaust system. At the end of the day, I can accept a certain amount of ugliness if it enhances functionality, but the limits of my sense of compromise end long before the tank/seat/exhaust all look the way they do. Of course that's just my opinion of the bike's look. Obviously the guy has some skills.


You old fart stick in the mud just bite your tongues, SNIP... also advise don't attempt it unless a lugwig, Schmidt, Comstock, Canaga Jves, hobot sort of resources.

It's hillarious that you include yourself in that group...
 
No place for nasty stuff .... specially when folks are separated by such large distances and don’t get to do real face to face discussion..... my 2 cents ....
 
I’m curious about the “D” shaped “single squish” combustion chamber. Something I never heard of.
If anyone has any info about that I would like to know how that would work on a Norton..

Pete
 
Nice job on the combustion chambers. Fast forward to 12.50. I’ve not seen it before on a Norton either Pete, but I’ll bet it works well.
 
I’m curious about the “D” shaped “single squish” combustion chamber. Something I never heard of.
If anyone has any info about that I would like to know how that would work on a Norton..

Pete
George mezzilini used to do them years ago ,
along with big valve heads and twin plug heads for Norton's,
And when I was last there he was working on triple plug heads for Ducatis he was a real character, sadly died of cancer 10 years ago his website is still up "Mez porting"
 
I would be curious to see the Ducati 3 plug head .... changing 2 of the 4 plugs on ST3s can be a pain , so I now use iridium , where would the third plug be located ? interesting experiment ....
 
I would be curious to see the Ducati 3 plug head .... changing 2 of the 4 plugs on ST3s can be a pain , so I now use iridium , where would the third plug be located ? interesting experiment ....
Well I seem to remember it being a 4 valve head with a central plug and one either side!!
But i'm starting to doubt my memory now!
I think he said it gave no advantage so he wasn't pursuing it
 
thanks for your efforts guys .... guess it was quite a while ago .... the twin spark head is plenty in the 3 valve IMHO ... anyway , cool idea though ....
 
Single Squish is similar to a bath tub head, some the hemi is weld filled for a wide area to smash jets of turbulence out when other wise mixture is compressed stagnant honey. Alas Commando racers found squish is about a non issue, except for collision risk, as similar power extremes attained w/o any squish at all. Still nothing bad and may help tolerate more spark adv on poorer octane for more response but not extra total power.
 
The single squish, or D shape that he shows is different to the more common bath tub, which is (more or less) symmetrical.

I am only guessing here, but I image the D shape suffers less from the possibility of valve shrouding, it may allow a better flame path, but more so, I imagime it must induce more swirl into the combustion chamber.

Like I say, I am only guessing as I’ve never tried it. But it does look interesting, and it looks well executed to IMHO.
 
The single squish, or D shape that he shows is different to the more common bath tub, which is (more or less) symmetrical.

I am only guessing here, but I image the D shape suffers less from the possibility of valve shrouding, it may allow a better flame path, but more so, I imagime it must induce more swirl into the combustion chamber.

The stock HD twin cam head as developed by Porsche has a bathtub shape.
https://www.google.com/search?biw=1...rNz_c#imgrc=l_rc1TQRMqFMnM:&spf=1523354093962

Stock twin cam pistons are flat with only small valve pockets:
https://www.google.com/search?biw=1...7IbiE#imgrc=-qCoFYGEQ9aR5M:&spf=1523354712966

In the article below it is claimed that the bathtub head shape is more efficient than the D-shape head which it replaced. However, having short distances for flame travel seems sensible to me. The deformed bathtub shape shown in the video is not very good in this respect.

Interestingly, when tuning the twin-cam's combustion chamber, many tuners (e.g., S&S) reverts to a hemispherical chamber design. It's worth noting that combustion chamber, piston and port design all play together, aiming at a compromise between gas velocity and swirl. Another interesting find is that the stock HD/Porsche bathtub design produces more torque in the lower rpm band than any of the tuning kits on test.
https://www.baggersmag.com/hot-heads

-Knut
 
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Thanks for that Knut.

Kinda presents more questions than answers though really!

I’ll stick to the standard squish band supplied by Norton I think.
 
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HOT DAM 84th, you're Redline URL's reveal Sundquist' frame and flat track fame that's more cafe' than the cafe's. I don't like his styling annoying angles of tank to seat either, nor the clunky carbon fiber muffler but recognize the comfort and posture, sound & mass wisdom, so I wouldn't care how common tastes react either. The engine is a souped up Combat - which he considers mild, compared to his flat trackers. If not attending flat track -may not realize what it takes to embarrass a National level XR Harley. Will have to ping him on frames and isolastics magic now I'm aware of Redline to tease him to try tri-links and hobot chopperish Roadholders.
Alas his OIF looks like after thought garden hoses compared to Peel so maybe learn him something too.
 
In the vid, he mentioned "aluminue" several times. The part he was talking about was put together of multiple small pieces made to look like one. WTF is "aluminue"?

BTW, Hobot, those "Z plates" were just flat plate cut to profile and sandblasted for a false relief. No actual factory Z plates were harmed. (Unlike the SS clone's hollowed shells of their former glorious selves)

I'm guessing Alumin(um) + (Gl)ue =
Aluminue.
He said he gets it from the States,
spreads it on then uses a torch.
He gives the proper name in the video though.
Cheers.
 
I believe the Aluminue is Durafix Easyweld Aluminium 3 in 1 solder, looks very like Lumiweld in the UK, same melting point and same need to use a stainless steel brush to remove the oxidation before use.
 
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