35 replies to this topic

[Steam]

retrofit a factory air pump system. There will be hundreds out there because they were crap & cost Hp so most ripped em out.  

[ansmania]

Danc, how does the provent catch the fumes? Did you plumb it into the exhaust? Does your exhaust smoke?

I’m thinking of a provent 100 given the tight engine compartment.

[Spider]

Thanks for the replies. I don’t have a canister anymore; IIRC, they didn’t quite capture fantastically.

 

One common reason for this is trying to use the System with a Non-vented Cap or other means of letting fresh Air in to the Crankcase, or that the Separator is choked up. They can be very hard to clean properly and often need to have the gauze material replaced after it's had years of 'fumes' going though it. however, normally the engine wouldn't 'fume' that much in the first instance, unless you are very regularly pulling very high revs - like 7000 +.

 

Besides, any oil in the intake will definitely reduce octane.

 

Unquestionably, yes, however in a Road Engine if it's in good condition, we're only talking academic amounts that would be next to impossible to notice and if you have your CR and Ignition set so close to the wind (knocking), then that's quite a risk anyway given the variability of fuel Octane as purchased and then as it ages in your fuel tank over even as little as a week.
 

 

[PACINO]

I did the "Evacusump as per vizard.." thing on my old 1380cc Mini engine Berkeley. It worked very well, I used a couple of "remote servo's" non-return valves that I found in the scrapyard. I will do the same again on my latest Berkeley project.

Hello, very ingenious the system. But what do you do with the Servo hose? I have it connected there. Well, maybe you don't have a Servo in your car.

Edited by PACINO, 11 March 2021 - 02:04 AM.

[Spider]

 

I did the "Evacusump as per vizard.." thing on my old 1380cc Mini engine Berkeley. It worked very well, I used a couple of "remote servo's" non-return valves that I found in the scrapyard. I will do the same again on my latest Berkeley project.

 

Hello, very ingenious the system. But what do you do with the Servo hose? I have it connected there. Well, maybe you don't have a Servo in your car.

 

 

The plumbing going to the Manifold - wouldn't a PCV Valve be more appropriate here ? A normal non-return valve isn't the correct valve to use, it will draw way to much 'air' through it, under some conditions it would draw a lot of oil from the sump. I've seen this happen a few times.

 

You could fit a tee to the Manifold for the Brake Servo and plumb both on to that, however, it's not at all a wise idea to do it that way. Ideally, as the factory did, there's be a separate threaded boss on the manifold for it.

[ansmania]

I have a Provent 200 and it's fed from the clutch breather and fuel pump blanking plate location. I use a standard pinhole vented cap on the (unvented) rocker cover to let a bit of fresh air in.

The 100 is probably a bit easier to fit as the 200 is a big beast!

Danc, how does the provent catch the fumes? Did you plumb it into the exhaust? Does your exhaust smoke?

I’m thinking of a provent 100 given the tight engine compartment.