Anybody here into porting/tuning chainsaws?

[zzr1200]

I'm interested in starting to get into this dark art, I have found a couple of youtubers that seem good.

 

[AVI_8]

Can you get a turbocharger kit for it with a hissing dump valve?

 

[Tangledfeet]

I've a friend that's into this kinda thing; I'll ask him...

 

[zzr1200]

Can you get a turbocharger kit for it with a hissing dump valve?

Hmmm.......lets think.....

 

[Gareth J]

I presume stock saws try to keep a relatively torquey range throughout. When tuning, what's the consensus? Do you aim for maximum power in a peaky rev band; tuned exhaust etc, just for the hell of it?

In theory, I love the fluid dynamics involved in 2strokes. In practice, I hate them.

 

[8ob]

Messed about with big bore kits,carbs, porting. Getting the exhaust system/muffler to flow better without it becoming ear shatteringly noisy is a challenge.

Bob

 

[AKN]

In theory, I love the fluid dynamics involved in 2strokes. In practice, I hate them

In that case it has to be a 4stroke V8.

Account Suspended

 

[mtt.tr]

It get involved,alot of people can't do it well.

And without a Dyno you are wasting your time.


So I say build a Dyno first

 

[Tinbasherdan]

I slapped a big bore kit on my 625 jonsered, haven’t faffed with anything else yet

 

[Fred Trevvett]

Messed about with big bore kits,carbs, porting. Getting the exhaust system/muffler to flow better without it becoming ear shatteringly noisy is a challenge.

Bob

Having run a 661 sans muffler I can confirm that does become a problem

 

[Screwdriver]

LOL sounds like a very time consuming (and piston consuming) sport. Great fun tuning two strokes and I am guessing most chainsaw engines will be in a verly low state of tune so they can run longer, more reliably and on slightly dodgy fuel.

One of the really big plus points for a tuned chainsaw would be the requirement for an expansion chamber exhaust pipe. Spannies! Most (all??) chainsaws will have a crude box with very little positive effect on port timing/power. You could achieve a massive power and efficiency boost with a decent spannie, you'd have to port the thing to enjoy the benefit. (OMG I'm getting drawn in!)

What you are trading in is longevity and reliability but you could have a whole heap of fun doing it!

I used to race two strokes and engine tuning/porting was all part and parcel.

Must. Resist.....

 

[8ob]

I slapped a big bore kit on my 625 jonsered, haven’t faffed with anything else yet

Sort the rest out and you will be able to run an extra tooth or two on the engine sprocket, that increase in grunt and higher chain speed makes a noticeable difference.

Bob

 

[Tinbasherdan]

Sort the rest out and you will be able to run an extra tooth or two on the engine sprocket, that increase in grunt and higher chain speed makes a noticeable difference.

Bob

I’m still waiting for you to dig me out a 900 series Jonny

 

[Lazurus]

spudulike - Arbtalk | The Social Network For Arborists

arbtalk.co.uk

This is your man its what he does for a living.

 

[Tangledfeet]

I asked my mate and this is what he's said - I knew he had at least one that's been ported:

I own a ported Stihl 064 - it's an animal. My Husqvarna 365XP isn't ported, but had a simple operation done with a Dremel which turns it (literally) into a 372XP - basically about 1/2hp gained for no cost.

I don't know of any definitive guide, and the process seems a bit of a dark art. Those who can do it well don't give away the knowledge. A word of warning...the ported saw I got off eBay had been ported well, but work done after it had been seized. Piston etc had been replaced, but crank bearing hadn't been and it disintegrated spectacularly during use. Fixed now by Peter and I, but shows even professional porters will take shortcuts.