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When you say a single weber won't get near, do you mean a DGV or a
> DCOE. Reason for asking is I've got (surprise, surprise) a 45 DCOE
> supposedly jetted for my B20 that I keep meaning to try....
I meant the downdraft DGV. I've tried the twin DCOE and the power is very impressive, but so is the fuel consumption. Given that a litre if unleaded costs 1.17 dollars or so that is an issue here in England. No experience of a single DCOE but it ought to be pretty good.
You didn't mention head work. Any suggestion at what stage that
> becomes important? My previous thought was than no new cam or
> additonal carb work was going to be value without spending serious
> money on head work.
Yeah I did, cunningly hidden by the "a bit of mild porting on the head" phrase. Any serious power is going to come from compression, which is realistically limited unless you resign yourself to using expensive octane boosters, head work, and exhaust.
Conventional wisdom seems to be get an injection head and bung it on. Injection heads are getting rarer and they have a nasty habit of cracking. The bigger valves response is only a half truth. If you look at the valve seat the actual seat witdth is massive. You can remove a lot of metal from the inside of the port, narrow the valve seat and gain flow without investing in bigger valves. Basically by making the hole bigger under the valve you are effectively making the valve bigger. You can also unshroud the valves, ie flare the combustion chamber out a bit to gain more flow. Unless you have a massive budget the standard Valve should be adequate. Getting rid of any sharp edges in the combustion chamber will also fight detonation.
You absolute must have the later double downpipe exhaust manifold. Here in Europe the cheapest big bore exhaust is a swedish 2" system. It uses a tubular muffler under the floor (Zoom tube), and a dirty great big rear box. Don't know what is available in the US. I think the Swedish system is 200 dollars or so here.
I'll see if I can find the diagram for the intermittent wipe I drew on the back of an old envelope, scan it and mail it to you. I "think" I used the relay out of a 240.
Regards
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