I think I broked it

[speedpro]

My MB100 is at 15.2:1. I've measured it at least 5-6 times just to make sure. My old TS100 was 14.7:1 and it was a long time ago but I recal my RG50s were around 15:1. Our sidecar with watercooled MB100 was around 15:1 as well and revved freely to just under 14,000rpm and made 19.9hp with a good power spread.

If it isn't revving freely you have some other problem, not too much compression. Having said that Wobbly has set my newest motor compression lower as the porting and pipe "should" trap more mixture in the cylinder and the pressures will be too high at ignition.

[koba]

Plug is dead centre. I have a head here if you want a look.

That would make it much easier!
Will have to have a gander sometime.

[koba]

Plug to be central or not?? I've built an engine with a head that had the plug offset to one side. I dynoed it and had it runing as good as possible. I then welded up the head and relocated the plug to the centre of the chamber. There was two things here - the plug was relocated and the combustion chamber shape was improved. The compression ratio was exactly the same. I got about a 15% increase in horsepower and the spread was significantly improved. This was a RGV250 cylinder.

Must spread more rep...

Cheers for even more great advice!

[quallman1234]

Piston's been ordered, just gotta wait for me to pay for it.

Do you know of any good articles to do with the transfer port timing? or any information on this.

-Kyle

[Skunk]

Piston's been ordered, just gotta wait for me to pay for it.

Do you know of any good articles to do with the transfer port timing? or any information on this.

-Kyle

A Graham Bell's book - Performance Two Stroke Tuning.

[koba]

Upper Hutt Library has a copy.

[quallman1234]

Upper Hutt libary says it should be back on the 22nd. Ill try get it that week.

But the real question is...

War Memorial Library
Non-fiction
629.2504 BEL
Onloan - Due: 13 Mar 2004
Lost copy (Set: 03 Mar 2008)

Who didn't take it back?

[F5 Dave]

Buy it you cheap barsteward, you will refer to it for many years to come, I still do. on line bookshop or Smalls in town will get it. I've seen pdfs (ok I might have one) but is far more useful as the book.


ahh heck here you go, on special 2nd edition;

click here fishpond

They even have a 'Skunkworks' book further down.

[quallman1234]

Can't buy it this week.
Nor next.

Snowboard (not for me) and piston this week.
125GP Racing money next week.

If i play it right i might be able to just afford it this week maybe!! Contradicting myself yes!

[gav]

Keep an eye on Trade Me, have seen the odd copy pop up on there.

[quallman1234]

New Piston - Check.

Now for the port timing.
Stroke = 50mm
Rod Length = 100mm

I better wait for the book utill i go any futhur