Does anyone have any experiance using an exhaust mounted check valve crankcase evacuation system? I have seen a few import race cars using them but it seems like anyone who is building a high HP V8, street or strip, has the system.

I spoke with someone of the Type-R Racing (Norris Pratoonto) crew and he claimed that they had seen 8-10whp from using this type of system on the Pelude motor.

For anyone that does not know what I am talkilg about go to http://www.summitracing.com and search for part # mor-25900 or mgr-6002 . These are the universal V8 systems.

 

Here is a pic of what I am asking about. Look at teh 1st side exit pic. http://dtrfab.com/headers/

Where do you think would be the best place to vent from, valve cover or block? It seems that all the all motor import aplications with side exit headers have been using the valve cover as well as the universal V8 kits beeing made for the valve covers. It seems to be convenient for them.

What do you think of venting from the block as per Endyn catch can set up and routing 2-1 (the 2 breather tubes) into the header after the merge point on a street car?

 

i have tried this system on our pro 4 car and it kept sucking oil straight out of the valve cover.if we had more time to add another baffle in the valve cover i think it may work.

brian
sangamon valley racing

 

you need to bung the valvecover from the front right side on the b and h series. It works pretty well on high compression and high rpm motors with high exhaust flows (which helps with a similar effect of a vaccum pump but no where as powerful).

Greg

 

thats wat an oil catch can is 4

 

Oh yeah they work great,but if you have the money invest in a dry sump kit for your motor,you'll have much better oil control and the added benefit of a vaccum pump as well.you will get more HP and best of all no more broken pumps.

 

Cheetah, Why mount the bung on the right side of the valve cover? What do you think of using the Z10 valve cover oil cap breather adapter for the vent? Also would all other crankcase vents need to be blocked or plug for the to work?

Compact-Tuner, Where was your vent in the motor? Maybe that was your problem.

As a note it looks like the breather in the V8 kits would act as a baffle. Are they a baffle?

 

Doesn't work with mufflers. The back pressure from a muffler pushes the exaust back into the valve cover.

Trust me, built a few monster V8's before.

 

Snowseeker, Do you feel it was a chamber muffler or the fact that the exhaust was to long being the culprit? I don't for see an exhaust that uses large diameter piping and a preforated core type muffler having that much back presure. And if I am correct the system I am talking about use a check valve so exhaust could not back feed into the valve cover.

I am contimplating using this on a few all motor cars of my freinds and customers that are making 200+whp. I would do this on their headers that have 2.5"-3" collectors and are using a 2.5"-3" exhaust. Sound is not a concern, as long as it has a muffler and a rear exiting exhaust to keep Jonny LAW happy. I don't for see a setup like this having that much back pressure.

Any more thoughts? Anyone?

Thanks

 

Lets keep it alive...

 

this thing needs a bump

 

bump

 

They were all flowmaster mufflers. Some two and some three chambers. There is a check valve that you use with the evac system but with mufflers there is always a backpressure so the check valves don't open unless there is pressure from the crank case.

But I am not saying it won't work on every car with a meffler. I haven't tryed it with a honda yet. Maybe with the 4 cyl engine there won't be as much backpressure as a 700 HP BB V8. Just might work.

the thread that is like 15 post's above this one states about a electric evac system. I know on some factory chevy (I think camero) came with a electric vac pump stock.

Alot of people runnin big motor cars use these for an evac.

It runs like this. =

A tube from the valve cover to a catch can, there is a tube from the bottom of the catch can that runs back into the block for oil drainage. The third tube running out of the top of the catch can runs threw the chevy vac pump and into either the intake or the exaust

I know any make of truck has vac pumps on deisel motors. But I do not know if these vac pumps can take the high revs of a honda. You could try one of these deisel pumps with a electric motor.

 

actaully....howard (from RLZ) and I were bsing earlier this week about trying something out on my street engine we're building.

i'm gonna cut my extra valve cover today for cam gears...and might install a nipple or two..just in case.