Rocker cover- baffle and fittings

[jsdvtr]

Going to be getting an8 fittings put onto my rocker covers going to a catch tank, how should I have the baffle on the inside?

Also which an8 fittings should I use?
http://www.ebay.co.uk/itm/AN-8-AN8-AN-08-STRAIGHT-Swivel-Seal-Hose-Fitting-/170815834646?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item27c56aca16&_uhb=1#ht_1205wt_689

http://www.ebay.co.uk/itm/AN-8-AN8-STRAIGHT-Teflon-Fuel-Hose-Fitting-/160396775275?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2558648f6b&_uhb=1#ht_842wt_689

[Ross]

-8 is quite small - why not -10?
For the fittings, I'd recommend something like this: http://www.ebay.co.uk/itm/10-AN10-10-JIC-10-Male-Aluminium-Weld-Fitting-Round-Base-/170840263682?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item27c6df8c02

Hose fittings are personal preference.

[jsdvtr]

An8 is what I've seen most people go for, an10 hose is quite big also. I've bought SS weld on boss's as rockers are steel aren't they?

Guessing just go for the top one of the 2 hose fittings with just the normal stainless braided hose?

[Ross]

An8 is what I've seen most people go for, an10 hose is quite big also.

I'd rather overspec a breather than underspec it tbh. Otherwise you'll be popping the dipstick out (or need to hold it in with a spring like some bodges I've seen). ymmv of course. I'm just making a recommendation ;)

Re the fittings themselves, there's some chat back and forth about fastflow Vs others etc on many websites. Some cut into the hose and mean the hose isn't reusable (do you plan to need to remove the fittings?) whilst others claim to improve the flow. For a breather, especially if you do go -10, I don't think it would make any difference, fastflow Vs stealth (or whatever torques call theirs). :)

[jsdvtr]

I'd rather overspec a breather than underspec it tbh. Otherwise you'll be popping the dipstick out (or need to hold it in with a spring like some bodges I've seen). ymmv of course. I'm just making a recommendation ;)

Well I have got an10 weld on fittings also as that was the size I was originally going to go with.

Well I've bought the swivel seal type fittings for the oil cooler lines which are the barb type but these are going to be removed.

[Ross]

Well I have got an10 weld on fittings also as that was the size I was originally going to go with.

I didn't have a problem routing -10 breather pipework - the runs are so short (unless you're putting your catchtank somewhere weird?) I've redone mine this year again in an10. :)

[jsdvtr]

I didn't have a problem routing -10 breather pipework - the runs are so short (unless you're putting your catchtank somewhere weird?) I've redone mine this year again in an10. :)

What sort of baffle should I have put in the front rocker cover? Same as how the back one all the way across the cover with just a single hole on the far side to the an fitting? Should there be a plate in the middle inside the plate to?

[Ross]

What sort of baffle should I have put in the front rocker cover? Same as how the back one all the way across the cover with just a single hole on the far side to the an fitting? Should there be a plate in the middle inside the plate to?

I've never seen inside of anyone elses other than mine I'm afraid - a lot of people are quite guarded as you know about the internal or exact specs. :(

On my own one (rightly or wrongly) I've got a small baffle, about 3-4 inches long, welded to the inside. It slopes away from the hole, but gives enough room for gasses to get up in there. The idea being of course you just want to stop oil surge and liquid oil getting in there too much. What I can say is try and mount your catch tank as the highest part of the engine pipework. If it's lower than the head, it will naturally want to collect fluid.

[jsdvtr]

I've never seen inside of anyone elses other than mine I'm afraid - a lot of people are quite guarded as you know about the internal or exact specs. :(

On my own one (rightly or wrongly) I've got a small baffle, about 3-4 inches long, welded to the inside. It slopes away from the hole, but gives enough room for gasses to get up in there. The idea being of course you just want to stop oil surge and liquid oil getting in there too much. What I can say is try and mount your catch tank as the highest part of the engine pipework. If it's lower than the head, it will naturally want to collect fluid.

I will most likely mount it on the slam panel I think by pas headlight.

Have you got any pictures?

[atspeedracing]

we use -10 - approx 5/8"

we also have laser cut aluminum baffles for welding inside the front rocker covers if you wanted one?

would recommend catch tank is used as a seperator with return/breather back to the block/sump.

make sure the filter on the tank is sufficiently sized too! we always go oversize
our rule we go by e.g. 2x 20mm pipes in = 40mm outlet/filter

- colin

[axsaxoman]

we use -10 - approx 5/8"

thats jic10 so to those not into aero fittingsthat is is a 5/8 or 16mm bore pipe

you cannot use small dia pipes or the gas speed due to bore size will lift liquid oil out with the pressure
just look at std breather pipes on jp4 engines --which do not have a crank breather
j4 has crank breather which joins to rear cam box to allow oil to run back to block and to equalise pressure above and below head level
If engine is j4 then you need 16mm from block +16mm from rear cam box ideally join with at least 16mm going to catch tank ,this should be a pipe that enters tank and the outlet in the tank should be at least half way down inside of the tank pointing to base of tank , tank needs to be tall not square ,so it has time for oil vapour to seperate from gas and the oil drop to bottom of tank.
I see nothing wrong with std baffles on std covers -providing crank case pressure is not excessive --if it is excessive then you should be looking at piston /ring/bore fit first and foremeost
there should be little crank pressure on a good engine .

the number of oversize pistons I sell is very small compared to no. of std size ones ,which suggests alot of worn bores are having new pistons fitted to them

all these engines are at leat 10-12 years old , --the result is usually excessive breathing when compared to a low mileage std engine

with that said it must be obvious that if you are running with more breathing than a new std engine ,eg worn bores ,etc then you will need bigger dia breather system

[jsdvtr]

we use -10 - approx 5/8"

we also have laser cut aluminum baffles for welding inside the front rocker covers if you wanted one?

would recommend catch tank is used as a seperator with return/breather back to the block/sump.

make sure the filter on the tank is sufficiently sized too! we always go oversize
our rule we go by e.g. 2x 20mm pipes in = 40mm outlet/filter

- colin

How much do you charge for them?

Say something like this then?

http://www.ebay.co.uk/itm/Green-Cylindrical-Breather-Filter-15mm-x-35mm-x-40mm-/200748464393?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2ebd8a7909&_uhb=1#ht_1795wt_932

[jsdvtr]

Which is better- j4 with an10 fittings or jp4 with silicone hose?

Im think the j4 as thats what most people are using.

[Ross]

Which is better- j4 with an10 fittings or jp4 with silicone hose?

Im think the j4 as thats what most people are using.

I used to run the JP4 covers but swapped only because I preferred the look of the J4, and some peace of mind about the exhaust cover degrading on the JP4 cover with the DP manifold. I've seen that front cover deform in that config - didn't happen to me mind you.

I think the better setup is the J4 covers, with an10 breathers personally - over the JP4 covers. Although the JP4 covers baffles internally are v good, just to throw a spanner in the works!

[jsdvtr]

I used to run the JP4 covers but swapped only because I preferred the look of the J4, and some peace of mind about the exhaust cover degrading on the JP4 cover with the DP manifold. I've seen that front cover deform in that config - didn't happen to me mind you.

I think the better setup is the J4 covers, with an10 breathers personally - over the JP4 covers. Although the JP4 covers baffles internally are v good, just to throw a spanner in the works!

Im undecided as i like the look of jp4 but ive also heard of them melting from turbo manifolds. Also the seals are better on jp4s! But i dont think the outlets for the hose are the size of what an10 is used on j4 covers. J4s with wrinkle paint on thought look really good.

[Ross]

Im undecided as i like the look of jp4 but ive also heard of them melting from turbo manifolds. Also the seals are better on jp4s! But i dont think the outlets for the hose are the size of what an10 is used on j4 covers. J4s with wrinkle paint on thought look really good.

Don't have to tell me that lol :p

tbh, I've had my J4 covers machined flat, and using Curil T for sealant, they've never leaked ever. But yeah, the JP4 outlets may not be man enough - and upgrading them isn't an option.

[jsdvtr]

Well danny has some i planned to buy with a baffle in by radtec. Think i may just get those.