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General Category >> Rubber Side Down! >> Messing with the insides.
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Message started by twistytwist on 11/06/05 at 20:23:15

Title: Messing with the insides.
Post by twistytwist on 11/06/05 at 20:23:15

Has anyone really gotten into their engines and played around? I'm wondering the cost and logistics of things like:

Shaving cylinder head to increase compression
Forged rod, piston
port, polish, valve job

Really just want to know if anyone has shaved the head and if their are any clearance problems involved, but i hadn't seen the topic covered (maybe just didn't look hard enough :-/), so i thought i'd open up the discussion.

Title: Re: Messing with the insides.
Post by bentwheel on 11/06/05 at 21:23:07

Woodworker has done some extensive mods to his engine. Do a members search and read his postings.

Title: Re: Messing with the insides.
Post by mpescatori on 11/06/05 at 23:17:32

Hello Twistytwist,
before the savage I had a Ducati 450 Scrambler, a big single by 1960's standards, which was a truly "tunable" bike, as it shared the same engine block as the track version, known as "Desmo".
You will certainly gain by porting the head, however a true head job involved working on ports, valves, compression and camshaft timing.
Done that you look at the carburettor and air filter on the intake side, and the exhaust, both in terms of 'tuned length of manifold' and backpressure generated by the silencer.
On engines where aftermarket parts do exist, it is often a matter of playing 'Meccano', replacing old parts with new ones. On engines where this option is not viable, then you should either refer to a reputable specialist or think twice before you do anything which is not reversable.
Possibly a good option coukd be that of playing around with a DR engine from a Suzuki enduro (650, 750, 800!), and fit that into the chassis for 'fun' days, leaving your LS engine standard .
I am looking at precisely this route.
Maurizio

Title: Re: Messing with the insides.
Post by mpescatori on 11/07/05 at 01:20:31

Oh, and by the way, don't forget that increasing hp will be a BIG stress on cranckshaft, bearings etc a LOT more on a big single than on a twi/triple of similar engine size...
M

Title: Re: Messing with the insides.
Post by Ed_L. on 11/08/05 at 06:34:18

Shaving the head to increase compression will cause timing problems with the cam. You are shortening the distance that the timing chain has to travel but not changing the pitch of the chain. It might be simpler to pull the head and have the combustion chamber decreased with aluminium weld. It's more than I want to do but might be another route to investigate. Just a thought on it all.

Title: Re: Messing with the insides.
Post by Reelthing on 11/08/05 at 17:49:39

we were kicking around the idea of a run of pistons the other day....

http://suzukisavage.com/cgi-bin/YaBB.pl?board=RubberSideDown;action=display;num=1129657225;start=1#1

Title: Re: Messing with the insides.
Post by lancer on 11/08/05 at 20:06:26

I'm game.

Title: Re: Messing with the insides.
Post by Reelthing on 11/08/05 at 20:46:19

me too, about 9.5:1 should keep it streetable in this summer heat on pump gas

Title: Re: Messing with the insides.
Post by Ed_L. on 11/09/05 at 15:25:53

You have caught my attention on the different piston, I'll raid my piggybank for one.