Engine Breathing?
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Engine Breathing?
Quick question,
I'm building my first big engine, and common logic would say to just to use the stock Vw breather/filler and be happy.
Thing is i'm using a porsche fan so have no scope for the stock filler, i'll be filling with oil via the dizzy hole.
So where should i fit breathers and what Dia, and to what?
its a 40x35 oval ported 044
86B cam
82x90.5
crank fired and GSXR ITB's
Any input?
cheers
Andy
I'm building my first big engine, and common logic would say to just to use the stock Vw breather/filler and be happy.
Thing is i'm using a porsche fan so have no scope for the stock filler, i'll be filling with oil via the dizzy hole.
So where should i fit breathers and what Dia, and to what?
its a 40x35 oval ported 044
86B cam
82x90.5
crank fired and GSXR ITB's
Any input?
cheers
Andy
- FJCamper
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Re: Engine Breathing?
Hi Andy,
Do you mean a 911-style shroud?
FJC
Do you mean a 911-style shroud?
FJC
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Re: Engine Breathing?
FJCamper wrote:Hi Andy,
Do you mean a 911-style shroud?
FJC
Hi bud,
Yes, for my sins, its a looks thing, but i intend to run 4 channel CHT to tune it over time...
- FJCamper
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Re: Engine Breathing?
Hi Andy,
Most of those kits come with an low profile oil filler neck that fits right over the stock Type 1 generator/alternator housing.
It has an NPT tap for a standard half-inch barbed brass vent in it.
But, if you're does not have that, and you have a universal case, you can use a Type 3 dipstock and oil filler tube.
Last, yes you can modify the distributor port to an oil filler.
If you can post a photo of your kit, or give us an URL, we can get more specific.
Thanks, FJC
Most of those kits come with an low profile oil filler neck that fits right over the stock Type 1 generator/alternator housing.
It has an NPT tap for a standard half-inch barbed brass vent in it.
But, if you're does not have that, and you have a universal case, you can use a Type 3 dipstock and oil filler tube.
Last, yes you can modify the distributor port to an oil filler.
If you can post a photo of your kit, or give us an URL, we can get more specific.
Thanks, FJC
- sideshow
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Re: Engine Breathing?
Remember it is crank case ventilation, not lets make oil leak from the heads ventilation. And I recall hearing that the Bergs used to run a -12 fitting above cylinder #1 in one of the drag cars, makes sense to me but I have never tried.
So what is wrong with the distributor hole?
So what is wrong with the distributor hole?
Yeah some may call it overkill, but you can't have too much overkill.
- FJCamper
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Re: Engine Breathing?
Hi Sideshow,
We have an 10-AN breather adaptor above cyl #1 on our hotrod 1600 engine, no kidding. It started life as a 8-AN, but we saw the need for more.
You mount a vented catch can (a condensor box) on the firewall above cyl #3, and run the line diagonally up to it. The pressure blows the oil vapor up into the can, but the trip up cools it all, and the vapor reverts to heavier liquid oil, which runs back down when it can.
The Type 547 4-cam Carrera engines used this system, with a fixed diagonal tube to the condensor box.
FJC
We have an 10-AN breather adaptor above cyl #1 on our hotrod 1600 engine, no kidding. It started life as a 8-AN, but we saw the need for more.
You mount a vented catch can (a condensor box) on the firewall above cyl #3, and run the line diagonally up to it. The pressure blows the oil vapor up into the can, but the trip up cools it all, and the vapor reverts to heavier liquid oil, which runs back down when it can.
The Type 547 4-cam Carrera engines used this system, with a fixed diagonal tube to the condensor box.
FJC
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Re: Engine Breathing?
Cheers guys, mine just has a block to mount the fan no filler.
I could use the dizzy hole as a breather and filler if I used a big bore pipe as your saying you and Porsche do, would that work as well as having it over the number 1 cylinder?
I could use the dizzy hole as a breather and filler if I used a big bore pipe as your saying you and Porsche do, would that work as well as having it over the number 1 cylinder?
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Re: Engine Breathing?
Hi Andy,
Nothing wrong with using the distributor hole. I'd run at least a 12-AN off it to a vented breather box.
FJC
Nothing wrong with using the distributor hole. I'd run at least a 12-AN off it to a vented breather box.
FJC
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Re: Engine Breathing?
And that would be all I'd need for breathing?
I was planning to use just stock breathing till the porsche fan came up cheap... So I'm a bit in the dark!
Thanks for your help!
I was planning to use just stock breathing till the porsche fan came up cheap... So I'm a bit in the dark!
Thanks for your help!
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Re: Engine Breathing?
Andy, I use a CSP breather box plumbed up closed loop into the air filters, there are no negs to such a system, no clogged up air filters, no jets blocking, no ping or hot running heads, I've heard all this neg from nay doers, dry sumping helps breathing on this particular motor admittedly, but I've used this method trouble free on many wet sump motors also, this motor has bulkhead room to spare, as will yours, crank case breathers and valve covers are vented here, also the dip stick tube is plumbed into the rh air filter, the system suits T1 with stock fan housing install also.
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Re: Engine Breathing?
Sounds good, I'll prob go dizzy hole into a breather box like you have mounted and the run that to my intake or maybe into the exhaust evac style??