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storm42

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Back to my detonation problem.

Today I have picked up some more AvGas and rigged up a rig to test the flow rates of the different fuels I have.

I have AvGas, Shell VPower, a 50/50 mix of the two and I have bought some Classic fuels 105 octane race fuel.

The test rig consists of a plastic jug fastened to a support, i have another container fastened just above the jug and a calibrated container underneath them both to catch and time the results.

I fitted a 270 jet in the jug and the container above, I filled the jug to the 1 pint mark and as I was timing how long it took to pass 200ml, I also put 200ml in the container above, this was to keep the jug at the 1 pint mark to keep the flow constant.

Sorry for mixing measurement standards. :)

The results. Minute, seconds, 10ths.

AvGas
1:40.00

VPower
1:40.85

50/50/ mix of the two.
1:40.36

Classic fuels, which is blue and looks like AvGas to me.
1:40.44

Obviously there is no difference in the viscosity of the fuels and therefor the detonation wasn't down to a weak mixture caused by thicker fuel. Must be the lead content that keeps the detonation away.

Anyway, I have AvGas again so the problem should go away, must be more organised and not run out again, the above was just curiosity.

The rig.
IMG_0173D.jpg
 
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Back to my detonation problem.

Today I have picked up some more AvGas and rigged up a rig to test the flow rates of the different fuels I have.

I have AvGas, Shell VPower, a 50/50 mix of the two and I have bought some Classic fuels 105 octane race fuel.

The test rig consists of a plastic jug fastened to a support, i have another container fastened just above the jug and a calibrated container underneath them both to catch and time the results.

I fitted a 270 jet in the jug and the container above, I filled the jug to the 1 pint mark and as I was timing how long it took to pass 200ml, I also put 200ml in the container above, this was to keep the jug at the 1 pint mark to keep the flow constant.

Sorry for mixing measurement standards. :)

The results. Minute, seconds, 10ths.

AvGas
1:40.00

VPower
1:40.85

50/50/ mix of the two.
1:40.36

Classic fuels, which is blue and looks like AvGas to me.
1:40.44

Obviously there is no difference in the viscosity of the fuels and therefor the detonation wasn't down to a weak mixture caused by thicker fuel. Must be the lead content that keeps the detonation away.

Anyway, I have AvGas again so the problem should go away, must be more organised and not run out again, the above was just curiosity.

The rig. View attachment 81058
Your a queer lot oop North, thats an old fashioned use of the word without the ++ after it, way too much time on your hands. So front end just about sorted, shims arrived today for setting the calipers, the steering races were loose also, been sorted, oil tank changed and AN fittings fitted, just waiting on a 120 deg union. Head steady fixed, breather system modified, various loose stuff retightened, ordered some JB weld to fix a hole in the exhaust, need to fire it up and check then ready.
By my calculations, the money I have spent plus my time will be equal to 3 seconds a lap, so has got to be worth it, right? I am in your race at Donnie Ralph so watch out, just don't use top gear on the straights and maybe go easy on the bendy bits. On the reserve list F750 but not holding out much hope.
 

SteveA

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Your a queer lot oop North, thats an old fashioned use of the word without the ++ after it, way too much time on your hands. So front end just about sorted, shims arrived today for setting the calipers, the steering races were loose also, been sorted, oil tank changed and AN fittings fitted, just waiting on a 120 deg union. Head steady fixed, breather system modified, various loose stuff retightened, ordered some JB weld to fix a hole in the exhaust, need to fire it up and check then ready.
By my calculations, the money I have spent plus my time will be equal to 3 seconds a lap, so has got to be worth it, right? I am in your race at Donnie Ralph so watch out, just don't use top gear on the straights and maybe go easy on the bendy bits. On the reserve list F750 but not holding out much hope.
Average 40 hours in the workshop for an hour of track time was what I used to reckon back in the days of only one day race meetings, but normally 4 races, 2 off 501 to 1000, Unlimited heat and final, 10 minutes practice session for each class entered.

I think it still works with the French VMA, because they have 20 minutes qualifying and 2 off 20 minutes races!

With the CRMC you are probably getting less!

Time counts. Money? Best not to count it!
 
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Well done Steve's! That's a lot of stuff to work through.
Donington is the first meeting to get off the ground for me for sometime.
I'm having problems with the website saying I'm not a member! Anj has given me a temporary log in but I cant find any details. The only confirmation I have is my son is out in the parades!
Hopefully I will be out.
 

storm42

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storm42

VIP MEMBER
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Average 40 hours in the workshop for an hour of track time was what I used to reckon back in the days of only one day race meetings, but normally 4 races, 2 off 501 to 1000, Unlimited heat and final, 10 minutes practice session for each class entered.

I think it still works with the French VMA, because they have 20 minutes qualifying and 2 off 20 minutes races!

With the CRMC you are probably getting less!

Time counts. Money? Best not to count it!
I do count the money but if our lass ever finds out the cost of racing !!!!!
 

storm42

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Your a queer lot oop North, thats an old fashioned use of the word without the ++ after it, way too much time on your hands. So front end just about sorted, shims arrived today for setting the calipers, the steering races were loose also, been sorted, oil tank changed and AN fittings fitted, just waiting on a 120 deg union. Head steady fixed, breather system modified, various loose stuff retightened, ordered some JB weld to fix a hole in the exhaust, need to fire it up and check then ready.
By my calculations, the money I have spent plus my time will be equal to 3 seconds a lap, so has got to be worth it, right? I am in your race at Donnie Ralph so watch out, just don't use top gear on the straights and maybe go easy on the bendy bits. On the reserve list F750 but not holding out much hope.
What word would that be Steve? :)

I have new pads to fit in the front and will change the brake fluid whilst I am at it. I will change the gearbox oil as well.

The kicker for me is, Jim has emailed me with a tracking number for my pistons, if they get here before the race, I may pull the motor and fit them, that will put the cat in with the pigeons.
 

SteveA

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What word would that be Steve? :)

I have new pads to fit in the front and will change the brake fluid whilst I am at it. I will change the gearbox oil as well.

The kicker for me is, Jim has emailed me with a tracking number for my pistons, if they get here before the race, I may pull the motor and fit them, that will put the cat in with the pigeons.
Sometimes....things are best put off till later! Honestly!
 
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Hi Steve
Peter William's memorial race sponsored by the Norton Owners club is for the 500s.
 
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Only the original! Lol
Remember club rules Steve, no copys of a one off machine!!! Everything else goes!
 

storm42

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Sometimes....things are best put off till later! Honestly!
Agreed, but.

I got my hands on the pistons on Monday and they wouldn't stop looking at me, I mean, it is only a Norton engine, won't take long, I have until Friday, what could possibly go wrong?

So, Monday night, engine on the bench and the head and barrels are off. Plenty of time so I put off the cleanup and rebuild until Tuesday. The first problem that occurred was the 2 front nuts that are on the studs that are in the barrel were loose, this was confusing as I do go round and round checking the tightness of all the nuts and bolts and my torque wrench is a newish Snap-on, plus I do have a feel for this sort of thing, oh well onwards!

Tuesday, cleaned the barrels and gave them a quick hone, then I decided to remove the 2 front studs so I could give the top surface a light going over on the surface plate with some wet and dry on it. The time is 15:45, and watching the threads in the barrel follow the studs out was a bit annoying, although it did explain the loose nuts. Finding 5/16 BSW Helicoils locally on a Tuesday afternoon was never going to happen. I could hear Steve's voice in my head.

There is now an entry in my notes for the engine that the front studs are now an 8mm thread and need a 13mm socket.

Wednesday, I use an anaerobic sealer as a base gasket, this stuff is very good and I have never had a base leak since I started using it. Unfortunately another property of the sealer is its ability to totally disappear when it is needed most. There is Steve's voice again.

Again finding this stuff locally wasn't going to happen and now there is no time to order it and have it delivered. Anyway after much searching I was given the number of a fairly local engine builder, who gifted me some and the build was back on. The racing community is the best.

Anyway the engine is back together and back in the frame, I am going in the garage now to connect things up and heat cycle it a couple of times and re-check the torque settings.

Removing the engine did find a couple more faults, the brackets that hold the exhaust to the frame had broken on both sides so I have to weld them up. So along with the pulled threads etc, I guess it was the right decision to replace the pistons, it could have cost the weekend if the problems hadn't been addressed.

Chris and Steve, there is a car track day at Donington on Friday and the CRMC are saying we are unlikely to get in the track before 17:00, early arrivers are to be held on the tarmac behind Redgate.
 
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