hey everyone

ive got a 1275cc... wat size extractors should i get?

at the moment it has 3into1 extractors that came off my old 1100cc.. i think they are similar to this... http://minisport.com.au/prod356.htm

will getting a better LBC setup make much difference? ....
was thinking maybe this? http://minisport.com.au/prod1336.htm

ill go measure the diameter of the extractors outa the head tomoro, but how big should they be for a 1275?

also... my muffler is quite loud... it sounds mean but bit to loud, wat kind of muffler should i get? i still want it to sound mean... but not so mean the neighbors complain wen i come home ahha

any suggestions appreciated
thanks

I don't know if that one is any better than the regular Maniflow medium bore LCB.
I tend to use this one http://minisport.com.au/prod73.htm
and so do many others here.
I have one on my 1360 (86.6HP ATW) and another going on the 1412 (113.6HP at the crank).
There is also a Chinese Maniflow copy that is cheaper still? and supposed to be good.

a common 3-1 works OK on a 1275 if the motor doesn't have heaps done to it. Our 1293 (twin HS4 carbs, Wade 104 cam, 1.5 rockers) made 59.4HP ATW with one similar to this-
http://www.minisport.com.au/prod356.htm and an RC40 muffler.
Fuel economy was good too.

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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.

ahh rightyo...

mines 1310cc, Kent road/race 286 cam, big valve head (needs porting/polishing ect..), 45mm delorto, few other things... goes alright... but i want more

Have you had the Dellorto tune correctly and do you know what the diff size is...other than that has the head had any work done to it

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Stop Licking the Dog...I Don't Care Who Started It

What about the Brownrigg units from Melbourne???

I've been hearing all sorts of negative comments recently about Maniflow.

Cheers, Ian

Maniflow do work well, but yeah the flanges never were flat, were they.
I wonder if the Chinese ones are better made..... it would be a first if they are.

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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.

gafmo... no head work as of yet, thats kinda next on the list if i can afford...
and yeah the delorto just came back from being tuned and setup right.

Hmm...no problems from two of the chinese ones so far....

You do have to relieve the center flange if you want to fit twin SU's however. Relieve sounds harsh however, simply grind a radius on the top of the center flange.....

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

were can i get chineese ones from?
make much difference from my 3-1 u thinks?

"Maniflow do work well, but yeah the flanges never were flat, were they."

They are if you hand them a cylinder head and have the manifold tailor made to fit
javascript:emoticon(':D') (but after 20 years they get a bit tiredjavascript:emoticon(':(')

Cheers, Ian

No idea power wise, but they are very free flow from their build. Noise is much improved, they sound great on a 1 3/4" system with a RC40.

Get them from any of the usual mini supplier culprits... @ around 230 or so...

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

ok cool thanks

...and the porting is the best I've seen on them. Have a look at them when you get the chance.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

does getting head work done make much difference on HP?

i know its a silly question but is it noticeable?

The improvement you'll get from porting a head is directly proportional to the expertise of the person doing the porting

Grinding a head is a very good way to make more power, especially if you're starting with a stock item.. but you can make things worse if you don't know what you're doing.

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Simon

The adventures of an owner builder in the Tallarook Ranges