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Author Topic:   turbo 350/tall valve covers
nate 11
Dirt Full Roller

Total posts: 52
posted February 24, 2002 12:52 AM
Have turbo 350. After 2-3 laps in low gear, it acts like it changes into second gear. Is this possible? If so, how do we fix?

Have tall valve covers: blows oil out of filters. Is this normal? How do we fix? (We put rags around it to slow it down.)

racer17j
Dirt Forum Champ
Total posts: 1565
posted February 24, 2002 06:09 AM UIN: 54865418
not sure about your tranny question but as far as the breathers go do you have front hoop bars? if so we used to take a old radiator hose and put that on the tube and then use an old piece of scrap cage tubing to hook your breather to the other end and tie it up to the bar that also makes a nice funnel lol

Machinah
Dirt Forum Racer

Total posts: 79
posted February 24, 2002 06:41 AM
The stock valve covers came with a baffle inside to send the oil back onto the rocker arms. Your sustained higher than normally intended rpm sends the oil through the pushrods at a higher velocity.

If you are using roller rockers you probably can't use the stock covers and I can't remember what the aftermarket solution to the problem is. Roller rockers actually don't help your motor much unless you are constantly over the 8000 rpm range. The tips don't like to roll until they reach 8000 rpm.

If you are running stock-type rockers, then switch to stock covers. The stock covers may not look as nice, but they will keep your oil on the rockers where it should be.

race8k
Dirt Forum Racer

Total posts: 98
posted February 24, 2002 08:24 AM
What do you mean they don't roll until you hit 8000 rpm.Where do you get this information? What about the flex of a stock rocker?Is this also unimportant

te33
Dirt Full Roller

Total posts: 46
posted February 24, 2002 05:21 PM
do you still have the modulator on the tranny?do you still have vacuum to it?get rid of it.it allows the governer to shift it.also check the shifter,vibration might be letting it slip into 2nd.its always the simple stuff,how much oil?if there stamped steel cheapees,there aren't any baffeles.so some oil is normal.if its a lot,you've got blow-bye problems.

Machinah
Dirt Forum Racer

Total posts: 79
posted February 25, 2002 05:00 AM
Race8k... Check out any HP books entitled "How to Hot Rod Your *******". They have written them on big blocks, small blocks and in Ford and Chevy. I have read this elswhere a couple of times in magazine articles.
The tips on these guys don't really roll until the high rpm of Drags, Indy, Can Am cars, etc. They intermittently roll a little and stick a little at lower rpm.
I have not read anything significant about flex but know that this is another feature of rollers. I doubt whether rocker arm flex is a great factor in short track, but I'm not sure.
I do know that there are a lot of expensive things out there that the manufacturers don't tell the entire story about. This is one of them. Why would they when everyone thinks that it's going to make their street car more powerful? Heck, let's put 'em on Grandma's car too.

6pack
Dirt Maniac

Total posts: 128
posted February 25, 2002 10:42 AM
If Grandma's car was a serious race car, I'd have "em on there!

029racin
Dirt Newbie

Total posts: 1
posted February 25, 2002 09:58 PM
I just had the same problem with the oil and it was a broken pistion ring.

bryanb30
Dirt Forum Racer

Total posts: 98
posted February 26, 2002 09:05 PM
hey what about those valve covers that have the hose that connects them together along with two breathers right in the middle of the motor? anybody use these? are they expensive or can a set be made in the ole garage at home? looks to me like it would let both sides of the motor vent and also control the oil too.....im in the hunt for a new set of covers and id like to know if anybody uses them..

Machinah
Dirt Forum Racer

Total posts: 79
posted February 27, 2002 04:41 AM
The connected valve covers are to equal the uneven pressures created at higher rpm. The oil needs to stay where it was intended to... on moving parts.

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