mikeyboi

just been thinking about an upgrade on my oil pump iv heard about the whole increase in pressure thing with adding the washer under the spring but what i want to know is where can you get hold of an 11 or 12mm pump im lead to believe theyre standard to the bugeyes and blobs? is that correct? also what else can be done to modify them?

mikeyboi

this is on a ej20 99 classic im pushing 330bhp so just want the added protection of good oil flow and pressure

alcazar

iTrader: (2)

I should drop David O'Brien at API a message, he does them on a return basis.

d-vide

Brilliant i was just about to order one off ebay for £180 for the 11mm but am now going to get one from API.
CHEERS Jody

Bikebloke

iTrader: (2)

mark at Lateral?

mikeyboi

yeah thats what iv already looked into but its effectivly just a bore'd out 10mm but id get an 11 or 12mm then put in the washer, does anyone know which models take the 11 or 12mm pumps as standard?

stedee

iTrader: (4)

The 10mm one flows plenty, you can get probs afaik running bigger ones, I,m running 400ish on standard 10mm

redace

Can i ask what problems people have had running a larger capacity pump. It the a problem with the oil returning to the sump in time?

stedee

iTrader: (4)

Yes and I think there can be problems with the relief valve overworking. Try asking on 22b forum

mikeyboi

so at 330-350 bhp id be alright running the normal 10mm pump? is it worth taking it off and giving it a clean or anything and sticking in the extra washer under the spring? thanks mike

stedee

iTrader: (4)

if you want peace of mind send it off to api , they do recon ones on an exchange basis. when i had my engine rebuilt i was asking the same questions as you and after speaking to a reputable engine builder i was basically told the oil pumps are actually quite reliable and the big end problem is rarely down to the pump after all. my pump was reused as i didnt have a big end failure before the rebuild but the tolerances were checked and the rotor was checked for scoring. i cant comment on what condition your pump is in but if its had regular oil changes and the screws havent come loose it should be fine.

mikeyboi

i have a spare one in the garage what should i be looking for to check its condition, was thinking of swapping it out, iv no reason to worry about the one thats on at the minute but having the cambelt etc done so thought may aswel lol

trails

iTrader: (41)

speak to your mapper about your set up, he will advise the correct size pump to use. AVCS heads are one of the main reasons for changing to a higher capacity pump.

stedee

iTrader: (4)

as above , there are clearance tolerances and check for scoring on the rotor, lol i dont know where or how to check myself, i paid someone to do it for me.

trails

iTrader: (41)

you can't **** about with the oil pump, its the heart of the engine...if in doubt pay someone that knows what they are doing