Is there a point where too much compression is bad for the engine ??

[FMP]

How much for a 5 gallon of toluene in Slough 65? Mix it 15% with your good pump gas

[powerabout]

What is never discussed on a "lake,river motor" is the load on your crank, I used to run very tight heads with the good fuel, and when the motors got torn down the thrust side of the rod journals were definitely abused, since then I won't run anything but stock compression on the river.

was that with double oil?

[phillnjack]

5 gallon of toluene is £59.99 or $82.73 us dollars. that if you shop around for it. in my area it is around 50% more expensive to buy.
so again not a cheap thing to buy here.. and its the storing of the stuff and legalities of keeping it around.

I have heard of a lot of people using the toluene in their cars, with some decent results.
but this leads back to the damage the higher compression is going to cause to internals for an every day motor.

if racing then yeah, get it as high as poss and dont worry about the cost of replacing parts and the availability of the parts.
if racing then the motors get stripped down a lot. the original poster I dont think will be wanting to take this motor apart for
atleast a couple of years, if not more.

[FMP]

I took a look and found it including the 20% for about 65.
So if you feel like turning it up a little with ign and fuel and prop on the limit psi that you use with just pump gas for a day or week , it's good.
Storage, don't leave it under the down spout of the eavestrough with the lid half cocked and you should be fine.

[phillnjack]

would be fine for racing.

[capnzee]

Are we speaking Pleasure Craft, such as a fishing/skiing engine or a full out racing engine? A Mercury V-6 on a general purpose Pleasure Craft for example will run very nicely at 150 PSI providing carburetion and timing is correct. I believe OMC would do the same. Compression higher than this gets dicey quickly

[powerabout]

what envelope?
what fuel?
what engine type?
what country?

[spybot]

£1.80 here
http://www.wycombeairpark.co.uk/wyco...acilities/fuel

£1.39 here +20%vat
http://www.nottinghamairport.co.uk/aircraft-fuels.html

avgas prices are published world wide, easy to find out
try and order a 205ltr drum from a supplier and see what happens?

Powerabout I stay in the East of Scotland near StAndrews in the east neuk.
//www.google.co.uk/maps/place/Anstruther/@56.222963,-2.7233229,14z/data=!3m1!4b1!4m5!3m4!1s0x4886542ed1ec3177:0x4a75ce6e2c035613!8m2!3d56.22298!4d-2.700539

Im Very limited as the fuel 99RON or Ethanol free, is nigh impossible to get my hands on. If you can find any for me i would be grateful.

Cheers Andy

[powerabout]

What fuel can you get?
In cool dry air you need to be careful

[FMP]

Are we speaking Pleasure Craft, such as a fishing/skiing engine or a full out racing engine? A Mercury V-6 on a general purpose Pleasure Craft for example will run very nicely at 150 PSI providing carburetion and timing is correct. I believe OMC would do the same. Compression higher than this gets dicey quickly

His isn't stock, if that's the example we're discussing. So dynamic pressure may alter vs a stock motor. Saying 150 cranking is good may not apply, his mods may enable a higher or lower starting point with respect to cranking psi so your fuel availability and tuning is it.

[BUZZIN' DOZEN]

[FMP]

Looks like 1 and a half

[spybot]

What can you get?
In cool dry air you need to be careful

What should i be careful about ?
The ethanol ?? The ron value ??
Or the whole jetting of the engine ??
Need help on that matter at a later date

[FMP]

Exactly, and don't forget the compression.

[spybot]

Exactly, and don't forget the compression.

That will be a seriously bad thing to have too much off.
A bit away from that yet Frank but will have to look into it.