Engine Modernization
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Rohan said:Wonder what bike and what dyno they had to get 58.9 bhp out of a stock bike.
hobot said:
Perhaps they are rating power in Shetland ponies.
Curve looks as though it was drawn with store bought french curve.
Much cheaper than actually dyno testing engine, and quite impressive.
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Just because Toms ads were done on Nortons 65 hp Combat dyno for base line hp, going by the handful of personal private email and voice contacts over the years plus Magazine articles test reports of that era - what ever the base line power Drouin adds at least 50% more mixture in, keeping in mind Bruce McGregor meekly mentions roll on 4th gear wheelies, so should kick my ass good enough and maybe surprise some sneering moderns too. For about $3500 right now the best bang for bux is the identical mate to Peels Drouin, as any Commando can handle the torque just not the red line rpms, so just gear up = which btw the era test reports and Bruce distinct detailing- Drouin does not really have a distinct limit to its boost pressure which can spike to 14-15 PSI Bruce said by hard fast the throttle snapped open. The drive train gear box may need freq service or upgrading to handle all the Drouin can deliver even on a totally factory engine, which has cross my mind lately when I put plane ole Trixie back oil tight again. Will allow testing the 750 dual pipe vs 2-1-mega effects too. A bit depressing when I exclaim how freaking shocked pleased with Peel against all comers in the toughest places I was thinking Commando people would be pleased put Norton logo name on strangers minds, but more like crabs in bucket one about to pop over the edge and the others drag em back in, sheeze. But vintage level performance is not my competition, modern stunt riders, hill climbers, drag and land speed and smoking puterized moderns up to maybe 150 or so is. I already tested the handling just need MO POW to wrap frame up tighter for more sling shot out of there on no traction what so ever hehehehehee, breath taking to point of black out w/o fighter blood control. Thats my story and sticking to it even w/o popular support.
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Getting back to EXTREMELY short modern pistons and the problem of minimizing the cylinder wall clearance.
The best solution here is to use Austenitic iron sleeves with Alum cylinders. Then you could reduce the cylinder clearance to around .004" (possibly .0035") and it might work (for awhile). Or someone could start making thick wall alloy cylinders that would not distort and take a Nikasil coating (dream on).
The Austenitic liners have already been custom made by Jim Comstock and used with moderately short pistons and everything looked and measured perfect after being raced. They would be beneficial with any brand piston in a Norton - the problem is they are not offered by Steve Maney or anyone else. To get them would require a large quantity order. If someone could find or make them to fit the Alloy cylinders it would be a big step toward modernization (hint).
The best solution here is to use Austenitic iron sleeves with Alum cylinders. Then you could reduce the cylinder clearance to around .004" (possibly .0035") and it might work (for awhile). Or someone could start making thick wall alloy cylinders that would not distort and take a Nikasil coating (dream on).
The Austenitic liners have already been custom made by Jim Comstock and used with moderately short pistons and everything looked and measured perfect after being raced. They would be beneficial with any brand piston in a Norton - the problem is they are not offered by Steve Maney or anyone else. To get them would require a large quantity order. If someone could find or make them to fit the Alloy cylinders it would be a big step toward modernization (hint).
The alloy cylinders in the Chevy Vega GT car that my Pops had years ago did 't hold up well, but IIRC they were silicon coated and not Nikasil, are coated aluminum cylinders being used successfully these days? (I should probably do a google search )jseng1 said:
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cjandme said:
Nikasil is the way to go but the Maney cylinders do not have enough wall thickness to resist distortion and depend on stiffer iron liners. Note that shorter pistons with longer rods would make it possible to shorten the portion of the thin portion that protrudes out of the bottom of the cylinders.
cjandme said:
Were they coated or were they the the silly etched high silicon aluminium like Norton used for the rotary engine side plates, I think one or two of the big Euro brands used it in a few cars as well.
As an alternative to Nikasil there are products like PS 304 solid lubricating thermal spray, it is not a good choice but there are probably other materials that have been developed by now
http://www.hohmanplating.com/index.php?page=surf-kote
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