Honing Advice
Turbo Mini Forums

I have a couple of blocks that need a quick hone before new pistons are fitted. I usually get this done at the machine shop but as I have two to do and they both need nothing else doing I thought 'd tackle it myself.

So, and advice on honing tools and tips on how to do it?

Cheers

Wil

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

I used one of these on my 1275.



Run it slowly in a variable speed electric drill and keep it moving axially with lots of lubrication. You can get a good 20-30 degree finish.

Not as good as a proffesional job by a long way but will help new rings bed in.

The trick is to get it near enough to the top of the block without it poping out!

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."

For what the guy I use charges I'd always take blocks to him rather than do it myself. He'll do a far better (e.g. even/more consistent job) with the proper machine rather than what I could manage by hand.

Toms right once again.

Not worth the trouble, you'll never get the cross hatch at the right angle. Let the machine do it right

I'd recomend Head Shop UK in Warrington.

Edited by Sprocket on 6th Dec, 2006.

no longer a series, but still 1.3 turbo.

Its only on TM I am ever right. In life I am usually wrong, or so my girlfriend tells me anyway..........

I just bought a Draper one, going to give it a bash. Cheap engine does not justify expensive machining operations as parts are within tolerance..
(Consider this dug-up)

Edited by hario on 17th Dec, 2008.

those flexihone look interesting, are these any good or a gimmick?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

The stones align themselves, the flex bit stops the operator honing at an angle, lots of Lube needed though.

take it to DRAKES at bradford
they have a CNC borer & honer and they get it right to the micron at 20c everytime!!

thats where all my blocks go wil

if you hand do it, as done for many years at most machine shops

you will get say 0.001" top 0.002" middle and some where in the btm 0.000.5"

in effect its like a hour glass and blocks done on their honer pick up between 4 to 6bhp and make more power for longer + the rings bed in 100%

Edited by BENROSS on 18th Dec, 2008.

I see, How much are you charged for a standard hone?
I assume you'v had blocks bored to say 4thou undersize then honed the last 4..?
Or do they do clean-up hones?
I just thoguht that the machining operation +postage Each way makes it not very accessible to amateurs ( Moi )