27 replies to this topic

[booton]

i've been stripping down my 998 engine and i found that it has a pin drive oil pump and camshaft.

would there be any problems with me changing the camshaft to a slot drive cam and pump.

Edited by booton, 12 March 2012 - 05:46 PM.

[03jkirk]

theres no problem with changing it (with the oil pump aswell obvs) but having the pin drive cam indicates that the engine has been worked on previously as these were not standard and this cam could be an upgraded cam. is there any reason you want to change the cam????

[booton]

how would i know if it has been upgraded.
it is a 73 engine.

[Ivor Badger]

Looks factory built with pin drive. You will need to tap 2x 1/4" unf holes to take the 4 bolt spider drive oil pump. Don't tap through the oil ways.

[booton]

if i just used a three bolt slot drive i won't need to tho would i.

[Ivor Badger]

if i just used a three bolt slot drive i won't need to tho would i.

No reason why you couldn't rebuild it with a pin drive oil pump, unless you wanted to use a cam only available as a spider drive.

[03jkirk]

no u wouldnt i m am just wondering why you are concerned about changing it??? and if you read Mini world April 2012 (still on sale) there is huge section about camshaft identifaction and this would help alot

[03jkirk]

he has not mentioned using a spider drive he is on about using a standard A+ slot drive

[booton]

going to turn it to a 998 turbo engine,
so would need a different cam.

[03jkirk]

first try and find out what cam you have as it might be sutiable for your purpose if it is a non-standard cam

[booton]

ok well just took the camshaft out.
cant see any marking here some photos.

looks like a standard one to me.



this looks different to me theres a slot machined in with a hole in. ( not seen this on any of my slot drives.)

[03jkirk]

those cam lobes look remarkable tall for a standard 998 engine have a look on this site and see what you think
http://www.mlmotorsp...topic,11.0.html

[booton]

did some measuring and the inlet 5.81mm ( 0.225,5") lift
ex 5.65mm (0.222". )lift.

that was measuring the both sides 29.10mm on one half and 34.91 on top of lob. which gave me a 5.81mm lift on the inlet.

[03jkirk]

what does it say on that web page about those sizes??? obviously you cant measure the duration unless u have it in the engine

[booton]

nothing.does match any. but it does't have a std 998 on it.