hey,
getting new extractors and exhaust made up, just wondering if anyone knew pipe sizes for extractors or had some made up and what the opitmum sizes would be?

engine 1340cc 7port head

cheers

Wouldn't it be the same size as the outlet of the extractors, any bigger would be pointless. Or did I get the jist of your question wrong. They're usually 1 3/4" or 1 7/8", 3" system is just a wa#k.

I'd say around the 1 3/4" to 2" but I wouldn't go any bigger than that. Staying the same as the extractors I reckon would be a good idea.

By the way what extractors are you using?
And what muffler system are you using?

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Respect mine and I'll respect yours.

1 7/8in with a single box back end. Lukey perforated system will fair thee well. 2 inch would be your max I would think.

Agree with the wa%k factor in the V8/WRX and 3-4 inch sewer pipes out the back - no worth in it and only of benefit if using dragway amounts of boost.

Hooroo

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Rob Forsyth
Miniot!!

thanks guys,
spoke to windsor exhaust the other day and they are making extractors and exhaust, and they asked what size pipe i want for extractors...

i found this,
http://www.minispares.com/Articles.aspx?ty=ad&aid=312

but mainly just seeing if any1 else had custom extractors and what sizes were used

Personally, I'd say that once they have asked a bunch of questions about the engine's design, use, cam characteristics, cc, etc, they should be telling you what sized pipe....otherwise find a different shop....

Who built the 7 port? Ask them what to run?

There is no such thing as a 1340, it's either 1310, 1330 or 1360cc Unless you're running some weird pistons?

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Lillee - 1969 Morris Mini K

Chong, if you use 72.5 pistons (GR has them) you do get around 1340cc.

As for a 7 port head, why not just use a Maniflow (etc) LCB.. 7 ports (unlike 8 ports) don't need custom made ones.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.