High comp pistons being fitted this weekend

[Jamoi]

Haha well yeah there is that too

[VTRDark]

Nice one Tony I too have no answer for the inner fairing.

I take it you will be continuing to tweak your carbs to suit. I was reading through some Harley stuff as they have the same as us with regards to running the rear slightly richer.

A fuel air ratio of 12.5 : 1 is good for maximum power, 17 : 1 is good for fuel economy and 14.7 : 1 is the ideal for complete burning and lowest emissions. Most people try for 14.7 since this is where the engine runs best and since too rich (12:5) wastes fuel, and too lean (17:1) makes an engine run hot. There are other things such as air temperature and barometric pressure which vary quite a bit so a carburetor is not set up for peak power (or maximum economy) unless you are prepared tweak it like racers do just before each race.

Some tune the rear AF to 12.5 and the front to 17.1, so one gets the best performance benefits at either end. With both mixture settings being at either end of the scale, one should end up with an over all average mixture somewhere between the two at 14.7.

(:-})

[mik_str]

One does not go to the trouble to rebuilding the engine with nice bits to improve fuel economy.... come on Carl.... set course at 12.5 Captain.... full torque ahead... arrrrrrrrrrrrrrrrrrgh!!!!!!

[VTRDark]

That is very true but it's not just economy there's longevity too, especially if one pushes compression ratio's and still uses regular fuel. Everything is a compromise and all things are to be considered.

(:-})

[Jscobey]

by regular fuel do you mean pump gas carl? cuz i will say that 11.5:1 is hardly "high compression" by todays standards. every I-4 1000 comes with 12.5 up to 14:1 compression from the factory and run fine with pump gas.

[VTRDark]

by regular fuel do you mean pump gas carl

yeh regular low octane pump gas.

Your right the compression is not that high when you compare it to modern sports bikes but it still raises the running temps. This was one of the reasons I posted the Octane thread which questions it. It also shows the measurement differences in fuel from here and the US. Yet again something else in place to confuse us like the US gallon and IMP gallon.

http://vtr1000.org/phpBB3/viewtopic.php?f=7&t=34591

(:-})

[tony.mon]

Could be, but it's already pinking slightly on ordinary 95 octane when opening the throttle wide from low revs.
Which is why I tend to run the expensive stuff when I can.

But to be fair even on strippign after three years there was no sign of detonation on the piston that survived.

I found out why it went from a wheelie to wheelspin in the wet, though- I'd pinched the sleeve on the alternator wires in the alternator cover, leaving it weeping oil onto the rear tyre.
All fixed now, and running nicely.

Best get it on the dyno again, I suppose....

[sirch345]

Well done Tony in getting it all rebuilt over the Bank Holiday weekend

Chris.

[tony.mon]

Time for the next phase, i think.
I've actually had a month off of bikes- I was seriously piffed oss when I found the crankcase was cracked, but it's now in Slipstream Tuning in Sevenoaks having it welded up.
I bought a little cbf600 as a runaround over the winter, but never got a replacement rad on it until this weekend just gone. I'd bought a 2nd hand one for a Hornet which looked like it would fit, if I made some brackets for the original fan. That worked out fine, until I poured coolant in, and it leaked out faster than a politician's promise the day after the election.
So I bought a new pattern part, which turned out to be a few mm smaller. No probs, except that it now won't clear.
Lots of bodging, cable ties and the rad now a t a slight angle, it's finally ready for an MOT.
Enough about a 600, back to the Storm.
I got so annoyed that I couldn't seem to get anything right lately that i didn't want to do anything to do with bikes for a bit.

However, I'm now back.
I had found some oversize inlet valves a year or so back; never got round to fitting them but it's now time, and so a spare pair of Jamoi's heads are going off the have the seats cut oversize, blended in and ready for a light gasflow.

The Hagon remote res shock has got very tired, and so that's going off for a refurb, new rod, seals, oil and gas.

And I'll finally get the jetting right...

All should be ready and fitted ready for Yorkshire.

[lloydie]

Have to get back on the horse at some point and this fine weather is a good inspiration to get cracking on with things .
I too found myself kicking a can down the road the last two weeks with this new engine , struggling to get it jetted right and now with it burning too much oil .
The love for tinkering is still there just need a reminder now and then .
Keep up the good work Mr mon


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[sirch345]

However, I'm now back.
I had found some oversize inlet valves a year or so back; never got round to fitting them but it's now time, and so a spare pair of Jamoi's heads are going off the have the seats cut oversize, blended in and ready for a light gasflow.

The Hagon remote res shock has got very tired, and so that's going off for a refurb, new rod, seals, oil and gas.

And I'll finally get the jetting right...

All should be ready and fitted ready for Yorkshire.

Good man Tony sometimes you need a break,

Chris.