New product

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Brooking 850 said:
Jim, any of these breathers still available?
regards Mike
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Mike,
I have more. I was suprised by the demand so I made another batch. Jim
 
ok sounds good, how much are they? i am trying to do a deal with a guy off this forum on a RGM belt drive in NY, so maybe I could do a deal and ship the lot here to NZ
regards Mike
 
Brooking 850 said:
ok sounds good, how much are they? i am trying to do a deal with a guy off this forum on a RGM belt drive in NY, so maybe I could do a deal and ship the lot here to NZ
regards Mike
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They are still $175.00. Priority mail is around $40.00 to NZ or $11.00 to NY. Jim
 
Sounds good, will get a definitive on belt drive then see if it is easier to post to you then all to me, or the other way around
regards mike
 
Hi Jim sent you an email about purchasing and posting one of these to me . Do you still have some and if so can i get one?
Regards Mike
 
Brooking 850 said:
Hi Jim sent you an email about purchasing and posting one of these to me . Do you still have some and if so can i get one?
Regards Mike
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PM sent. Jim
 
Jim

Could you please explain how a (your) crankcase breather helps with producing more horsepower?

If the pistons are pulling on a vacuum, wouldn't you loose power? Or am I missing something here?

It must work, because a lot of different performance engines run them.

Do you still have any for sale?
 
pouchy750 said:
Jim

Could you please explain how a (your) crankcase breather helps with producing more horsepower?

If the pistons are pulling on a vacuum, wouldn't you loose power? Or am I missing something here?

It must work, because a lot of different performance engines run them.

Do you still have any for sale?
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With an open breather horsepower is wasted in the effort it takes to pump air in and back out of the crankcase with each rise and fall of the pistons.

With a reed breather on the crankcase air is pushed out the first time the pistons go down but none is allowed to go back in when the pistons rise, so the next time they go down all that will be pushed out is the tiny amount of blow-by that has gotten by the rings.

This loss is referred to as pumping loss. On a Norton it amounts to 2 or 3 horsepower average gain if the holes from the crankcase into the timing chest are blocked when the reed is installed.

When there is a vacuum in the crankcase any extra power used to push the pistons up is regained when the piston goes back down.

A dramatic example of how much power it takes to pump air in and out of a hole is a "Jake Brake" on a diesel truck. They slow the truck down by raising an exhaust valve slightly off it's seat with a solenoid. Pumping air in and back out of the open exhaust valve is what slows the truck and makes all the noise.

A truck's Jake brake is much more effective because of the high compression ratio. The compression ratio in a Norton crankcase [ ie the volume of the crankcase with the pistons up divided by the volume of the crankcase with the pistons down] is much lower so it wastes much less power but the principle is the same.
Jim - I have a few.
 
Jim, as you have sent me one of your breathers, (and may well be in the market for another!!!) do I need to pull the timing chest and mod it as I understood can I run with the breather mod and do the timing chest if ever I pull the engine apart.? Undersatnd how it works, I take it I get best the advantage of timing chest modified?(Not at home yet to collect breather)
Regards mike
 
Brooking 850 said:
Jim, as you have sent me one of your breathers, (and may well be in the market for another!!!) do I need to pull the timing chest and mod it as I understood can I run with the breather mod and do the timing chest if ever I pull the engine apart.? Undersatnd how it works, I take it I get best the advantage of timing chest modified?(Not at home yet to collect breather)
Regards mike
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The reed breather will still work without doing the timing chest hole mods but It will draw more vacuum with the holes plugged. It basically raises the crankcase compression ratio.
Feedback I have been getting has been that it cuts oil consumption and stops leaks without plugging the holes. Jim
 
I guess that this wont work on my combat motor. I dont have a sump filter. Engine number 202XXX.
 
Johnnymac said:
I guess that this wont work on my combat motor. I dont have a sump filter. Engine number 202XXX.
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The sump breather will not work however my original design reed breather will bolt up to the back of your combat motor. It is listed on the CNW site. Jim
 
Thanks Jim, will probably be on to you for another sonmetime in Jan, have just picked up a really good '73 850, but cant get to it until 7th Jan, then will check it all over then get back to you.
There is a post on here about the holes to be balnked , do you know which thread it is.
Regards Mike
 
I'm looking for the picture on plugging the crankcase for this breather conversion & how to accomplish it. I saw a picture somewhere on the list but now can't find it, can someone please repost? Jim I've sent you a personal email asking about price including delivery.
 
pouchy750 said:
I'm looking for the picture on plugging the crankcase for this breather conversion & how to accomplish it.
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If you have an early bike you can plug it with a 1/2-20tpi plug. See my pic below.

Jim, thanks for this functional work of art!

New product
 
I'm bringing up this thread because I am interested how they have been working and if Jim has any ready for sale.
 
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