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Oil Pressure

Hi
I have recently replaced the cam in my 202 but have notice weird things with the oil pressure. If you take off an bring the car up to speed really quirky the oil pressure come up then drops right off. But If I slowly bring the car up to speed the oil pressure comes up an stays up. It still drop back a bit but this is due the oil heating up I am sure??

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Make sure you have the proper amount of Oil in the Sump (4.3 Litres for a 3.3 Litre WB ).

The Dipstick Tube may have been pressed in too far and is giving a false reading ... http://holdenpaedia....

If the above is OK, then the Pickup Tube may be loose. There's a good reason to drop the Sump and replace the Gasket if that's the case.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

Nah I always run about 5 litres of oil in it but I have been using a thinker oil latterly so I was wondering may by if it is getting pumped up to the top of the motor an isn't coming back down as quick as there is oil mark on the bottom of the bonet were the from breather is.

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william2123

Also to drop the sum I would have to pull the motor out out would I
??

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william2123

Click on the Link in my earlier post. It tells you how to remove and replace the Sump without taking the Engine out.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

" if it is getting pumped up to the top of the motor an isn't coming back down as quick"

That may be the case. Cam Bearings are another variable.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

If the cam bearing it would do it all the time an they looked good when I put the new one in.

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william2123

I doubt it is oil being pumped into the top of the engine causing your issues unless you are driving really hard !. It will take a lot of revs to run the sump dry .I have circuit raced holden sixes and in my experience it takes a substained period of big revs (eg , between 5000 and 75000 rpm ) to necessitate a drain from the rocker cover back to the sump or the use of restricted oil flow lifters( edge orrifice) to keep the sump full.The oil mark on your bonnet would be more likely to be excessive crankcase pressure from worn rings causing blowby than excessive oil in the rocker area. I have seen a few engines give erratic pressure readings like this when they have bad wear on the main and/or big end bearings.

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Cheers,
John.

JH how do you get your 202 to hit 75000 rpm? Have you got a dyno sheet? lol

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hmm.

Hi Sandman . Yeh not easy to get them old sixes to rev to that!.I did mean 7500 , not 75000 rpm ! (too much beer).I'll give you a quick rundown of some of the specs anyway as 7500 is going ok for a six and keep in mind it would rev a bit harder but 7500 was a sensible limit!.

202 black block bored 30 thou. Internally polished and oil galleries modified.main and head studs fitted.
Fully Counterweighted black crank lightened and knifedged counterweights.Bmw 4 cylinder conrods (Longer rods,giving a rod/stroke ratio better than a 186. Part of the secret!.) Cosworth forged pistons with gapless rings, fully floating gudgeons.Duggan alloy 12 port head( now j-zed), slightly modified exhaust port and a specially ordered small combustion chamber as per Phil Irving 12 port. 1.65 to 1 rockers (stainless duggan ), Iskanderian springs and retainers. Running around 13.0 to 1 static compression. Cam was a wade solid with a massive 266 degree duration at 50 thou and on a 102 degree lobe centre. Custom 1 3/4 primary extractors into a 3 inch system built by John Brookfield ( the guy from hughes/brookfield who originally machined and finished the original Irving 12 port heads). Only letdown was probably carbs. Was running triple 48mm dellorto's but really needed 50 or 55mm to really get the best out of it. Never dyno'd but educated guess judging by performance was around 320-335hp.Obviously many,many more modified parts to aid reliability!) like oil pump,big volume sump, stud girdle,custon built bits like cam retaining plate ,pulleys etc. phew !, you get all that!. The limits are how many $$$$ you have! I would not like to reproduce this engine at todays prices!.
A racer mate here in Tassie built a Phil Irving headed 202 with 55mm carbs that dyno'd at 361 hp on the local Tafe dyno (accurate heenan and froude dyno).

These engines were both in a circuit race application and most DEFINATELY not streetable!. some of the musclecar masters torana sixes are being pushed to almost 8000rpm with the j-zed 12 ports!.
I think if I had put gold aircleaners on the dellorto's I may have got it to rev to 75000!.

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Cheers,
John.

Bmw conrods, thats a nice tip, cheers. I'll build a 202 powered rail if I ever get the time, they make a good sound at those high rpm.
I guessed the beer added the extra zero to the rpm's, its was good for a laugh!

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hmm.

How old is your gauge? Could the gauge have picked up a bit of [Naughty Pottyword] from the build?
You would have fitted a new oil filter and new oil?

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Well Its only done 30 000 kms off it last major rebuilt an I have had the head off a few times an the doesn't seem to be any oil in the cylinder plus it doesn't smell or seem like it using or burning oil. The motor doesn't seem to have any end play or movement on the crank. But [Naughty Pottyword] in the oil to the gauge is possible. It has also had a few filter an oil now also.

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william2123

Tip. 75% of engine wear is at start up. Use thinner oil NOT thicker oil as it can get around the motor quicker. All oils provide pretty much the same film thickness and protection once operating temp is reached. Go for a lower low value like 5w30 instead of 20w50. Think about it. Also, new oils are always designed retrospectively for all engines past and present. Put that in your tyres and smokem

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5 - 30 minutes. That's about how long you could expect your 202 to last on 5w30 oil. It sounds like good advice - if you like rattles, chronic oil leaks, and inevitable low-mileage engine failure. Most "modern" oils are not suitable for older engines, unless specified as such by the manufacturer. Don't trust me - have a good long look at the "Penrite" website to learn the facts.

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If you have every run a 202 on oil less than 5w 30you would now that you can't develop oil pressure out of the motor till about 3000 rpm even then not a great deal so this is not a good idea. Foxed the oil leaks now any way new sump gasket.

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william2123

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