3t/2tg blowby.

[shelldrake]

So, Perhaps something similar would be to:

pcv* -> catch can -> intake manifold -> out the top of cam cover with filter.


*(using mech fuel pump hole - don't want to drill into block at this stage)

[merc-blue]

wont work i did some reasearch the whole system needs to be closed,
I recon you get a proper catch can?
A baffled oil/air seperator

there is no real benefit to a PCV system,
Once you hit any decent revs you lose the crankcase vacume and you generate more blowby and suck it stright back down the intake

I think i will be running a oil/air seperator from the cam cover with a return line (with a carby fuel filter on it) that has "fallen off" my intake

[Turdinator]

MWP, the problem with this is it doesn't 'suck' from the crank with the twin camers. The 2TG head blocks any route for the gas to escape from the crank to the cam cover.

Fuel pump hole may be a good idea though. Will have to have a look at that. Good idea Merc.

The Witzl, the problem with that is if your using the 3T block or the non 'G' 2T block you have nowhere to remove the crank case gas's from when using the twin cam head. Otherwise you would use the stock system as toyota clearly knows what its doing.

Merc-blue, this is why i thought mabe use some sort of pump to create the vacume. I know that there are some yankee companies making vacume pumps for the v8 drag engines. As vacume in the crank case leads to better sealing rings and less air drag on the crank at higher revs and its reduces oil leaks. How benificial this actually is i'm unsure.

For example check out this site.

[MWP]

MWP, the problem with this is it doesn't 'suck' from the crank with the twin camers. The 2TG head blocks any route for the gas to escape from the crank to the cam cover.

Im not familiar with the 2T-G... but so how does oil return?
Air should flow from the sump to the cam covers via the space around the timing chain.

[merc-blue]

timing chain is out the front of the front main seal and the cam seals

[The Witzl]

how the hell does the timing chain get oil then???

[Turdinator]

Im not familiar with the 2T-G... but so how does oil return?
Air should flow from the sump to the cam covers via the space around the timing chain.

how the hell does the timing chain get oil then???

Both are very good points. I may be wrong. I'm not sure where the timing chains are oiled from. More research will be done...

[sillycar chick]

Eddie,
I reckon maybe it would all be easier if you just got the vent box thingy off a 2TG and bolted it to the block like on the 2TGs.... Did that with my hyrbid and I havent had any blowby problems yet, have had the thing running for about 9 or so months now and no problems (touch wood now that ive said that)...

Im a little confused about this theory that has been mentioned that the twin cam head blocks off the pushrod holes where the single cam head doesnt...

River has a lot of good diagrams on this thread.... http://www.toymods.net/forums/showth...?t=1139&page=2
But the links are all down at present, I'll ask him to fix some up and have a look at the differences in heads, and how both styles of engines vent... failing that I think all the diagrams are on a CD he sent me a while ago with 2TG stuff..

Anyways I'll post up my findings/thoughts tonight when I have a chance to refresh my memory with some diagrams...

[TheToyman75]

But for others who weren't there. It worries me that by creating a hybrid 3/2TG you block of the crank case ventalation on the 3T block, with the 2TG head. As on 2T and 3Ts the crank case vents through the push rod tubes to the rocker cover, then out a tube and into the carbi/airfilter. On a 2TG there is ventilation on the side of the block, as the twin cam covers the push rod tubes. See above links for diagrams.

I am at work so will get back to this later but:

On a Single cam T series engine there are 8 push rod tubes, fitting a twin cam head only blocks 4 of them (Different ones depending on 2TG or 3T-GTE heads)

You can see the 8 holes in the block here:


As you can see one of each pair of holes remains for oil drainage.


Stress not my friend !

[shelldrake]

Even so, if you felt the amount of pressure coming out the top of the cam cover, it may indicate some cause for concern...At the moment Turdinator and I have been exploring a few options and the best idea so far is to -

run a tube from the mechanical fuel pump blockoff plate to a catch can filled with steel wool -> into the inlet manifold

and

from the top of the cam cover and into a second input on the catch can

We were originally thinking if we could find some sort of vacuum pump to go after the catch can and before the manifold it might be good. But we figure mucking around with a few ideas may determine the best option.

[merc-blue]

Let me know how it all goes, i will let you guys work out the best way and then copy it