P11, P11A, 750 Ranger Engine thread

[p400]

cam timing - link count when all dots are aligned

 

[texasSlick]

Got this tidbit from the history section of the NOC:

" In 1966, the 650SS and Atlas were being fitted with a double delivery six start oil pump worm, along with enlarged internal oilways and pressure feed to the rocker box. Left and right handed Amal Monobloc carbs were used; this simplified adjustment of the right side unit. Another modification was spigotless barrels, it was claimed in order to give longer cylinder head gasket life. This is open to query, lower cost of production could well have been the real reason. "

So I would assume spigoted barrels and earlier monoblocs mean 3-start pump drives; non-spigoted barrels and handed monoblocs mean six-start pump drives. Mid-67 and later bikes would have coil ignition, concentric carbs and six-start worms.

points moved to the timing cover in mid-69, somewhere around 131000 (which only applied to the Commando, and maybe a handful of 'special orders', like the N15 of Ludwig)

I have no clue why, but my '63 Atlas, engine #102xxx, came factory new with a 6 start pump. Otherwise, the oil delivery to the head is as early Atlas models. Another oddity with this bike is the orifice in the carb needle seat is 0.200", standard is 0.125". Any explanations?

Slick

 

[p400]

Have the newly machined cylinder back with pistons from JS Performance.
I am going to fit a thicker head gasket from Jim Schmidt as well, awaiting delivery.

 

[p400]

Head is complete and ready for install.

 

[p400]

Crank is installed with FAG Superblend rollers both sides, .012 float
Carillo rods per JS Performance.
This why I posted an earlier link count/dot position......just loosely assembled timing at this point

 

[p400]

P11 balance factor has been revised from 90+% to 65% , actually I don't have the paperwork in front of me, so I think it is now 65....whatever Jim recommended per instructions.
shown base gasket to be replaced with copper .021 from JS Peformance.

 

[CanukNortonNut]

p400,
Nice work so far.
Did you choose the "lighter" weight con rods?
I am doing pretty much what you are on your P11. Same pistons and con rod setup.
Why are you getting a thicker base gasket. The change in pistons should bring you up to about 9:1 compression? What is your target compression ratio?
Cheers,
Thomas
CNN

 

[elefantrider]

I like the gold zinc plated engine plates.......never noticed that before on your previous bike photos.

 

[p400]

my compression ratio is to be lower than std JS ratio, so thicker head gasket (.062") should lower comp ratio.
engine plates are "as found/takeoff" from this nice P11, I am not refinishing oem clear coat that has yellowed.

now concerned with "piston rock" from heavy exhaust side, WTF?, so looking into this per JSmotorsport.com instructions.

 

[CanukNortonNut]

p400
I took a second look at your picture and I looks like you are not using the locking tabs on the bottom studs on your crank :shock:
I hope you are using loctite as a sub.
Regarding your plans to put holes in the piston skirts....isn't it kind of late now after you balanced your crank?
Edited: piston-balancing-and-dilling-t21980-15.html I read the thread on doing these holes and there shouldn't be and issue with the balance.... Carry on.
Cheers,
Thomas
CNN

 

[p400]

installed tappet location plates, safety wired

 

[p400]

installed cylinder/head studs

 

[p400]

received the new .060 head gasket and .021 base gasket. Well packed as usual.
ported out the head gasket for improved clearance around push rods.
mods not shown here tho.
There is a need to anneal this new head gasket.....red hot , then air cool.
Not sure about annealing base gasket.

 

[elefantrider]

Why not just use the flame ring gasket? I would not personally drill holes in new pistons. Looks like crap, and is of no value. Get them coated instead.
Did you post any pics of this new project bike, I could not find any.

 

[p400]

small progress today - installed pistons from top, push pistons to bottom with rod holes exposed, hovered cyls with spacers, installed pins/clips, sealer applied to base gasket, cyl set with nuts.
still need to anneal new head gasket and install head

 

[p400]

had to keep the cylinders up to allow applying sealer to both sides of copper base gasket.

 

[Bernhard]

I was fitting Mini Mk1-2, 1100 valve seals way back in the early 1970s :shock:

 

[elefantrider]

Spray copper coat works great on head gaskets and coats evenly. Just terrible to breathe.

 

[batrider]

It looks to me like the safety wiring on the tappets is backwards. Shouldn't it be trying to pull the bolts tighter?

Probably not going anywhere though.

 

[BillT]

It looks to me like the safety wiring on the tappets is backwards. Shouldn't it be trying to pull the bolts tighter?

Probably not going anywhere though.

If you take another look, I think you'll see they're tied properly.

Remember that these wires are on the nose of the screw, so wired like a left-hand thread.