Hey guys can anyone tell me what the squish band measurement is on a stock fl350 with 80 mm bore
Should be
Sorry i should have added a bit of history with this Engine
(1) it was a std bore of 78.5 mm when i got it now its 80 mm
(2) can anyone tell me if the cylinder heads were different between the 329 cc Engine and the earlier
348cc Engine

Danno,

I am running an 80mm piston in my Ody now with a post recall (angled fin head) and I have a squish of .090" (2.286mm).

This is running with the following setup.

Stock thickness cylinder base gasket (.016"), (0.406mm).

Top or bottom piece of the 3 piece stock head gasket set (.004"), (.101mm)

As far as the cylinder heads, I couldn't tell you if the head volume is the same. I can tell you that the fins in the head are straight on the pre-recall heads and angled on the post recall heads.

Rand

Randman are you still running pump gas on yours?
Ive tried to measure my squish band using solder wire which measured 2.91 mm but could not get any crush on it
My setup is a oem base gasket (alluminium)
With a standard head gasket from a vesrah kit
And a straight fin head
Im guessing my squish band is at least 3mm or more but i think i might have to re-measure using clay
Have to try doing it without taking the head off .might try wrapping the clay around a piece of soft wire and coating the clay with a little oil so it wont stick to the piston or the cylinder head .
What do you think

Danno,

Yes I am still running 91 octane pump gas. I could reduce the squish all the way down to around 1.25mm and still be safe to use pump gas. The minimum squish limit you are after is no smaller than 1.016mm (.040"). However unless you have some material cut from the top of the cylinder, you are not going to get a squish which is less than around 2.032mm to 2.285mm (.080" to .090").

On my Ody I have to use 3.175mm (.125" standard thickness in USA) solder to get a squish measurement. One trick you can try is to get a strand of soft rosin core solder and fold a couple of pieces together to make a length of around 150mm. Then take the two or three pieces and twist them together to make a fatter piece of solder. You may need to use thinner solder than you have right now to be able to twist them together to make something thick enough.

You can lower your squish band by doing the following.....
Your Vesrah head gasket should be three pieces which are held together by three small tabs on the outer edge. You can easily separate the three pieces and just use one of the thin .0106mm (.004") pieces which will lower you squish to a more favorable thickness of 2.28mm (.090").

Just remember, with the correct jetting, at above 1.2mm squish band clearance, you are safe running premium (91 octane minimum) pump gas.

Rand

Got it thanks randman i will try that tonight when i get home from work
You see ive never bothered checking the squish band before because the last two oddys ive had ive just run as reconditioned stock engines (want to keep them reliable)
But thought i have a bit of a play with this one (should be interesting)
Thanks again
Danno

Ok randman ive removed the head gasket and replaced with one of the thin sections as you instructed
Re-measured squish i have now got 2.21 mm
Will this be ok ?
Ps i normally run 98 octane in all my engines

How do you guys rate your octane here its RON + MON = octane

Ok we got ron (reaserch octane number) 98 octane suitable for all cars especially high performance high compression engines but we also do 91 and 95
Not sure about MON can you enlighten me hoser

I don't know all the silly details about octane I just know what octane rating here I need to prevent problems, I know their is many different ways they rate octane so we need to make sure were on the same page, meaning your 98 might be the same as our 87 octane only because they way they do the math.

http://en.wikipedia.org/wiki/Octane_rating

If you search octane on the web their is all kinds of info again I never studied it because I know what number to look for on the pump here for my needs.

No doubt you know what number to look for on your pumps too.

Around here highest you see on our pumps is 93 octane get out west your lucky to see 91 octane even at lower elevations, around here 87 is the low out west you easily find 85 octane at the higher elevations.

Yeh ok hoser ive just been reading a bit on mon (motor (( Internal Combustion Engine ? )) octane number) very interesting
So what your saying is that your octane number is governed by the altitude your at .?
We don't have that issue over here ,im not sure if you know it but this country is as flat as a pancake
With the exception of mt kosiosko and a couple of smaller bumps
The rest is sand clay and red dust
So we can go any where in ozz and get 91 95 98

Sorry hoser just had another thought doesnt your pump fuel also contain ethanol
Maybe that is also taken into consideration when they calculate the octane levels required in your part of the world

Danno,

2.21mm (.087") squish is fine and is the same as mine and others who are running the thin single gasket. The only way you are going to reduce the squish lower than the 2.21mm is to have material removed from the top of the cylinder or have the head shaved and re-cut to a lesser volume, however, this is not necessary as your Ody will run fine at 2.21mm.

You want to make sure you are running at minimum 91 octane gas. As Hoser mentioned, we yanks might be on a different scale from you blokes down under, so run the highest octane pump gas Australia has to offer.

Now you mentioned that you have the straight finned head. You may want to locate one of the angled fin post recall heads as it will provide better cooling.

The most important thing you need to worry about is being jetted properly. Better to run a bit rich on an air cooled Ody than suffer the top end seizure when pushed hard.

Rand

At higher elevations their is less air available for your Engine to build compression so you can run lower octane, higher octane fuels cost more so most oil companies offer lower octanes.

Most the pump gas here has 10% ethanol yes and this also raises the octane but the octane is tested after its blended.

Mutts are or were trying to push a 15% ethanol blend on us.

another 5% will screw with anything that has carbs on it even worse

looks like they passed it
but its not required as of now
they only recomend that the 15% mix should be used on 2001 and newer trucks and cars(aka fuel injection)

heres the article
http://www.epa.gov/otaq/regs/fuels/additive/e15/

the only this i couldnt understand abought this artical (http://content.usatoday.com/communities ... W7_o9uF9e0) was
"Even though the E-15 blend is intended for cars and trucks -- indeed, it's technically illegal to use it in other engines"


i liked this part

"Burning ethanol can cause toxic air pollutants to be emitted from vehicle tailpipes, especially at higher blend levels like E-15. The chemistry is fairly straightforward: ethanol burns hotter than gasoline, causing catalytic converters to break down faster."

maybe that's why everyones cats are going bad???

What about E-85

Ok well so far we havent got that problem but that's only because the government wont subsidise the farmers for growing ethanol crops so for the time being were ok
It is a very interesting subject and one that will undoubtly affect us all eventually
lol maybe we should look at convertng our oddy and pilots to hydrogen or lpg power !

Thanks for getting back to us randman
Like i said before i never run anything less than 98 octane
And like you said just make sure i run it with a richer air fuel ratio to begin with
Thanks again guys