fitting undercrown jets on a 998 cc engine
Turbo Mini Forums

i am thinking about fitting the ford undercrown jets onto a 998CC block

has anyone done this before and is the location the same as a 1300CC block to get into the oil gallery?


any help is more than welcome...

not needed. the 998 a+ conrods have a hole pointing up to the underside of the piston that oil conveniently squirts out of

Yes i moved to the darkside

Instagram @jdm_brett

Do they? Learn something every day.

I didn't think it was possible to fit them on 998 block anyway.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

This is where they go on a 1275 block.




Don't have any pictures of a small bore block to compare with.

You should be able to gauge the drilling angle required to hit the gallery by looking at/measuring the block.

As Brett said, there is no need on the 998.

The rods have a squirter hole that used to send oil to the little end/gudgeon pin for lube when the rods were fully floating. Even with the pressed fit pins, the hole is still there, although the hole in the little end is not.

Picture shows early rods with both holes on top of later rod.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Edited by Vegard on 18th Nov, 2010.

No need. The same system as on 998 was used by Alfa Romeo on the v6 turbo engine.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Renault 5 GT Turbo too if memory serves ...

Do I understand properly that the only oil going to the piston side is from the hole on the crankshaft side ?

Rusty by nature

i want to fit some ford jets to my turbo 1174cc (1098)
first thing to ask i guess is can it be done are the castings 1275 and 998 (1098) the same in the galley positions and stuff?

correct me if im wrong but i think the rods only spray oil or any real amount whilst the crank oil feed hole is aligned with the rod squirt hole?
i would think the ford jets are beneficial as they would spray all the time?

Have a search for BMW jets, they only use a single M8 x 1 (if I remember correctly) banjo bolt, whereas the Fords require a feed and a mount.

There are modern ones that Ford use which are single bolt but I'm not sure on the part number/availability and chances are you are referring to the older zetec ones?

I think there is some truth in the fact that the oil jets do not always spray the underside of the piston.

But thinking about how fast the engine is rotating, it's going to be flying about everywhere, so shouldn't be a problem.

As it happens I think that fitting the jets is not possible on the 998 block. But that's just in the back of my mind, not sure anyone has tried/failed.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

I wouldn't bother with em on a 998. There are plenty big power 1275 a's without any squirters.

If something is worth doing, it's worth doing half of.

It can be done. GaryOS did it with Paul H help.

This is the thread but the pictures have gone:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=225814

I feel that it is unecessary unless you are thinking of over 200hp.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

How does oil come out of the small hole by the little end?

Surely the rod isn't drilled all the way from the big end to supply oil up there, so I'm confused as to how this is supposed to spray oil...

www.topcatcustom.co.uk

oil comes out of the squirter on the big and and dribbles into the hole in the little end I think?

If something is worth doing, it's worth doing half of.

can the jets do any harm? provided a good pump is used of cause