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Head choice for a hot 1100

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mini-dunger

Post subject: Head choice for a hot 1100

Posted: Sun Aug 27, 2006 3:12 am

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

hi there, I have come to the engine build stage in my resto and I need to choose a head.
In terms of value for money what should I do ? Buy vizards book and a die grinder and do up my 12g202 (port job,shave,valve grind) or buy a variant of an 1275 head? or any other variant anyone may suggest. I have 2 12g202s and an 1000cc head(smaller valves) somewhere too.
I have no plans to convert it to unleaded fuel as I have no issues with using an additive.
I also do not intend to force induct this engine.

as always your thoughts and opinions will be greatly appreciated.

cheers

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blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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drmini in aust

Post subject:

Posted: Sun Aug 27, 2006 8:50 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

Personally, I would just port the 202 head out, it's a bit of work but worth it. And you will learn a lot doing it..... :wink:

Fit 998 Cooper inlet valves (31mm, 1.219") and open the valve throats to suit.
If the exhaust seats are a bit sunk from high mileage, get some oversize ones (1.062", 27mm) from Karcraft. Or if they're REALLY bad, fit unleaded seats- (costs about $140), and get new 1.000" exhaust valves.

After porting and chamber work, deck the head to get around 9.0-9.5:1 C/R. More if fitting a big cam.

_________________
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. :mrgreen:

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mini-dunger

Post subject: head

Posted: Sun Aug 27, 2006 7:28 pm

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

Thanks Doc
I will go and get me a copy of vizards.
Cheers

_________________

blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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MRClubby1098

Post subject:

Posted: Thu Jan 11, 2007 9:41 pm

848cc

Joined: Mon Jan 08, 2007 12:03 pm
Posts: 179
Location: SCONE N.S.W 2337

go the 12g295 Head they do wonders to the 1098 and also grab your self a sw5 swiftune cam MMMMMMM i can smell the power

_________________
@#$%Things are not what they used to be
Missing one inside of me
Deadly loss, this can't be real
Cannot stand this hell I feel
Emptiness is filling me
To the point of agony
Growing darkness taking dawn.

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drmini in aust

Post subject:

Posted: Thu Jan 11, 2007 9:46 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

MRClubby1098 wrote:

go the 12g295 Head they do wonders to the 1098 and also grab your self a sw5 swiftune cam MMMMMMM i can smell the power

Yes the 295 is nice, but getting rarer now. Nothing in a 295 that can't be got from a modified 202 with some grinding. :wink:

Graham Russell prefers the 202 for making race heads, in some places they allow port shape to be improved over a 295.

_________________
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. :mrgreen:

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TheMiniMan

Post subject:

Posted: Thu Jan 11, 2007 11:40 pm

Bimmer Twinky

Joined: Mon Sep 06, 2004 4:36 pm
Posts: 8606
Location: Brisbane

BMW K1 motorbike twin cam cyl head

:-)

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

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mini-dunger

Post subject: old thread

Posted: Fri Jan 12, 2007 12:49 am

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

This is one old thread. I have got a die grinder and a couple 12g202 heads. I just need a carbide sp? burr and I can start hooking into it/them

_________________

blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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Smokie

Post subject:

Posted: Fri Jan 12, 2007 7:54 am

1098cc

Joined: Mon Mar 07, 2005 11:18 am
Posts: 1607
Location: Townsville, Qld

Hey MRClubby1098, how's things in Scone. I used to live there a few years back...

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drmini in aust

Post subject: Re: old thread

Posted: Fri Jan 12, 2007 2:09 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

mini-dunger wrote:

This is one old thread. I have got a die grinder and a couple 12g202 heads. I just need a carbide sp? burr and I can start hooking into it/them

I'd grab one of Vizard's 2 books if not got already. It has pictures, and dimensions...

_________________
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. :mrgreen:

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gafmo

Post subject:

Posted: Fri Jan 12, 2007 3:09 pm

the King of Bling

Joined: Thu Jun 03, 2004 11:11 pm
Posts: 19858
Location: Baulkham Hills

I can't read writing only pictures ROFL

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

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mini-dunger

Post subject: porting

Posted: Fri Jan 12, 2007 4:13 pm

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

So you dont recommend porting by feel doc?. I was just going to fire up the grinder and follow my heart.

_________________

blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

Top

drmini in aust

Post subject: Re: porting

Posted: Fri Jan 12, 2007 8:10 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

mini-dunger wrote:

So you dont recommend porting by feel doc?. I was just going to fire up the grinder and follow my heart.

Well it's pretty hard to make an old 850 head worse, but with a 202 I'd seek some idea of required mods first. If you get carried away and hit fresh water, it's a doorstop. :wink:

As David Vizard once said, speed equipment is only any good if it actually does add SPEED.

_________________
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. :mrgreen:

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Sir Yun

Post subject:

Posted: Fri Jan 12, 2007 11:26 pm

848cc

Joined: Thu Jan 26, 2006 2:57 am
Posts: 50

a write up i did on an other forum of my first effort porting a 202 (done a fair few 12g940 heads). a lot of work ..this head still has to be dyno'd..

http://www.guy-croft.com/viewtopic.php?t=532

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no time to finish me bleedin car ..
1982 Blue-White Roof.

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mini-dunger

Post subject: thats great

Posted: Sat Jan 13, 2007 12:01 am

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

Good post mate. I am not looking forward to it.

_________________

blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

Top

drmini in aust

Post subject:

Posted: Sat Jan 13, 2007 6:24 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

A few pics of the last 202 head I did. It went on a 1220 Sprite motor with Imp flat top pistons.

Pics taken before final polishing.
Valve sizes- 33mm inlet, 27mm exhaust.

_________________
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. :mrgreen:

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