Just wanted to know why the sleeve of the 353 isn't illegal with the 2 boost ports below the exhaust port.

That's why. The holes below the exhaust don't do a thing, only when the piston is at TDC, then some fuel flow will go through to the connecting rod - it never opens up during the combustion cycle.

I don't have a 353 sleeve in front of me but if the holes are below the exhaust port, they NEVER open the crankcase to the cylinder. Therefore, they are NOT ports.

We had that issue in Holland and our technical rules were the old EFRA rules. The EFRA has now written that the piston on the lowest position only 4 ports are visable.

Biside that as mentioned, they aren't ports, they are just channels to use a small amount of mixture to cool down the piston at that side.

exactly what I said, sheeesh!!

We know that is what you said... But more people confirming what you said is better...

So, according to what you guys have said... the modification on the sleeve on the left is completely legal??

I have placed the piston BDC and the custom boost port does not open... The problem in my track, is that one of the engine rules says:

-Only 3 ports and 1 exhaust ports.
-No additional holes in the sleeve.

If we abide by the second rule... All the 353 engines would be disqualified instantly, right???


Roelof, you said that old EFRA rules changed... Do you happen to have the old and new rule book? And when did it change?? I revised the ROAR rule book, and it does not mention anything about any extra holes in the sleeve, so I guess its legal to them.

I just want to get to know where did my track copied the rules from. Because if I ain't mistaken, the rules that my track uses, are from many years back, and they rarely update them.

From the EFRA rule 5.1
http://news.efra.ws/fileadmin/docume...andb10App7.pdf

The bold part could be a rule once brought in by the manufacturers but never notice taken by the the drivers. So yes, you may dril as many holes in the sleeve but the may not be seen above the piston in the lowest position an in the piston there my not be holes (boost ports).

If we did stick to the old rules we should have disqualified a lot of racers and nu manufacturer can be set responseable for local ruling.
We did take out this rule, in this way if not listed in the Dutch rulebook the EFRA rules must provide the answer (as we have set the tree of rules).

f*ck the rules!
engines dont win races..chassis setup,tuning and driving skill do.
jmho

Its not really a custom boost port, just an additional hole in the sleeve to allow the oil in the fuel to reach the bottom/inside of the piston for cooling purposes.
Though it does look like an intake port, who did the mod on that sleeve? Does the 353 come with a hole there originally?

The sleeve has normally 2 holes:
http://www.novarossi.it/images/publi...t/08679-09.jpg

It is not for bringing fuel/oil under the piston, it will only splash against the outside (the part that does close the exhaust and blocking all the heat from the resonance) to cool the piston down.

That is a sleeve of a Novarossi Flash.

Yes, the 353 has two small holes in that place.

That modification was done by a close friend of mine.

Thank you my spit-brethren amigo.

Didn't remember your username here.


So, yeah, maxflo777 is the one that modded that sleeve.

Thanks for all your input guys. Some people over here like to yell "illegal" or "cheater" where it doesn't fit.