Reducing 5E cc

M

Murray

Member +
I know you are trying to keep the CC of the motor down to stay in the 2000cc and under class.
The 5e would be classed as an engine swap and therefore would move you to a modified class of some sort.
Nobody would no until you start winning and then some people would start questioning things:haha:

The easiest thing to do is to sleeve the block down and find some pistons to suit. Is it really worth all this hassle though? What you up against in your class?

Murray
 
Gord R

Gord R

Member +
Murray, correct, didnt say it was going in a starlet though!

Some fairly quick stuff down here both road going and mod prod.
 
Texx

Texx

Super Moderator
The piston diameter vs stroke needs to be taken into account, if you have an engine which is too off square by having a rather small piston crown surface compared to the pistons stroke, you could end up with an engine that doesn't want to rev.

I would expect a 4E bored to 75mm would be a much happier engine than a 5E sleeved to 72mm.
 
Rob H

Rob H

Member +
Thinking on what Texx just said would sleeving the block leave enough space in the bore for the rods to move freely. I am thinking like when you have to notch out the block for scat rods in the 4e would there be enough space at the bottom of the bore in the 5E?? it would be a lot of work to fined out the crack carnt turn cos the rods get stuck!!
 
H

-Harry-

Member +
I think Tex is right. Far to much effort and you will probably be worse off. If you run the 5e, I doubt anyone will notice unless your winning. Over here in cams it costs around $500 to put in a protest against a team for capacity and on top of that if the people is found innocent, the accuser has to pay to rebuild that persons engine. Due to this there are very few protests.

Id go with the bored 4e and put your time and money into developing the car further rather than chasing every possible cc.
 
S

Skalabala

Member +
You can only change cc by changing the centre offset of the crank big end.

best will be is to use a 4E
75mm pistons and get 30thou big end bearings.
Offset grind the crankshaft to give a shorter stroke by 0.375mm
this will give you 1374cc

And I do not think I have heard of a 75mm 4efte overheat?
So why not get 75.5mm? And have a screamer of 1393cc :D

Or.

4AGE series 2 engine.
offset grind crank by 1.375mm and fit 30thou 40mm bearings with series 1 4age rods
stroke will be 75.625mm and then sleeve down to 77.5mm
This will give you 1427cc :)

Do you want any cheapest option?
Any light small engine? That can make power?
 
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