486 replies to this topic

[Jacko-lah]

a thing ive wanted to know for ages is..how do you pocket a block? like can it be done DIY or does a machine shop have to do it for you?
i have a 940b head that i could use but many people say that a 295 will be better for a 998 without pocketing the block...but where can you find a 295?
last thing..would a 202 head be suitable?

sorry to invade your thread buddy! Great build, I watching this with interest as this is a similar spec to what im planning on..

I don't see why you can't do it with a dremel.

[PhilipGCaldwell]

I don't see why you can't do it with a dremel

i did the bulk (80% probably) of my porting with a die grinder with a large burr attached, the rest of the porting (smoothing out lumps and bumps etc) was done with a cheap rotary dremel like unit i have.

I spent most of my attention removing the large restrictions around the valve guide boss and the valve throats rather than the ports, as it says in the yellow bible that going too large on the ports on a small bore will actually start to reduce power, i would say now that the valve throats are approx twice the zize as they originally were (I could barely get my little finger through past the valve throat, but now i can get my thumb in)

Edited by PhilipGCaldwell, 27 October 2010 - 05:34 AM.

[1984mini25]

I don't see why you can't do it with a dremel

I originally tried pocketing a block with a dermal; it’s now used as a very heavy paperweight.

Luckily the new block, that wasn’t in as good as condition didn’t cost me anything and only cost £45 to be pocketed properly by martin at mra minis.

[MiniLandy]

If you can source a good MG metro (is it the 649?) cam like 1984mini25 has done then this is cheaper aswell than buying a brand new cam unit.

The MG metro cam is pretty much the same, durations wise, as the Kent 266 MegaDyne. Very good all round cam, i'm using one in my 1275 project.

Looking good by the way

[1984mini25]

If you can source a good MG metro (is it the 649?) cam like 1984mini25 has done then this is cheaper aswell than buying a brand new cam unit.

The MG metro cam is pretty much the same, durations wise, as the Kent 266 MegaDyne. Very good all round cam, i'm using one in my 1275 project.

Looking good by the way

Well all I had to go on was the ex’s genuine 1275 mg metro with that cam in as standard, that went like ******* of a very shinny shovel. Plus the decent used cam I bought only cost me £20, as it was listed wrong on flebay.

[PhilipGCaldwell]

luckily at work we have a very hefty compressor and a very good selection of die grinding burrs so the pocketing shouldnt be a problem
I may try and source a metro cam, will save me £60 compared to getting new, I have heard off other people that they are a great cam for use in a pocketed 998

Edited by PhilipGCaldwell, 27 October 2010 - 12:24 PM.

[MiniLandy]

luckily at work we have a very hefty compressor and a very good selection of die grinding burrs so the pocketing shouldnt be a problem
I may try and source a metro cam, will save me £60 compared to getting new, I have heard off other people that they are a great cam for use in a pocketed 998

As the chap above pointed out, you can get good second hand cams, for a bargain price. I picked my 266 up from the MITP autojumble for £20. As well as a big valve, ported 12g940 for £40, but now i'm just bragging

[1984mini25]

luckily at work we have a very hefty compressor and a very good selection of die grinding burrs so the pocketing shouldnt be a problem
I may try and source a metro cam, will save me £60 compared to getting new, I have heard off other people that they are a great cam for use in a pocketed 998

As the chap above pointed out, you can get good second hand cams, for a bargain price. I picked my 266 up from the MITP autojumble for £20. As well as a big valve, ported 12g940 for £40, but now i'm just bragging

Na I can top that one, spotted an engine/gearbox on e-bay with hardly any description or picture/s.
Spotted it was local though, so thought it was worth a punt at asking for a look, turned out the bloke lived down the end of the road. Lol

Popped round and deal was done for £30, ended up with a decent enough recently skimmed block to use and all the other 998 bits to build up a full working engine, a spare gearbox, gear rod mechanism (already had 2 spare) a box full of bits, a brand new pancake k&n filter and a weather shield, both of which went straight onto the 25.

If I work it out, I paid £30 to start off with, sold the head and cam £35, the spare gear rod for another £20 and the gearbox for £30. So I’m £55 up and still have a few more unwanted bits left over.

[PhilipGCaldwell]

excellent work!

[MiniLandy]

Hahaha, nice one! Can never have too many spare gearboxes when it comes to minis!

[1984mini25]

Hahaha, nice one! Can never have too many spare gearboxes when it comes to minis!

True but it had a fully floating sump plug so was of no use to me.

[PhilipGCaldwell]

All honing finished



Pistons 'offered up' to see how they fit/feel. and they seem great, a snug fit, not loose or tight

[mk3 Cooper S]

Have you measured the bores or the piston slop using feeler gauges?

[PhilipGCaldwell]

Have you measured the bores or the piston slop using feeler gauges?

not yet, just offered them up for now after I finished honing, will do it in time. was just for demonstration purposes thats all

Edited by PhilipGCaldwell, 01 November 2010 - 01:49 PM.

[miniobsessed]

Maybe it's the quality of the pictures or my laptop screen...

Have you 'cross hatched' the honing?