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Home > Help Needed / General Tech Chat > supercharger and cam

Arnoud

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160 Posts
Member #: 1085
Advanced Member

Netherlands

1st Mar, 2009 at 10:59:31am

Hi all,

with fitting a turbo one of the warnings is not to go overboard on cam duration (max MG Metro is suggested). Does this apply to supercharging as well? I bought a supercharger kit off Ebay and I also have a Kent MD286 lying in a corner of the garage. A Longman GT15 head would top it all off. Any thoughts?

cheers,

Arnoud

1963 Cooper
1975 Pick Up


BENROSS

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9812 Posts
Member #: 332
Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

1st Mar, 2009 at 05:05:37pm

that cams over the top as you say it will be a pig and very unpleasent to drive in traffic, .......... ok on the track balls out
go for th N/A MG metro cam or a KENT 266

that head will be just fine but........ you will have to calc your compression ratio to mid 8s or lower if you want to run a lot of boost, you can do tis by altering the chabers increasing the volume in the head and or a combination of that and piston change,
i can provide this service for you with the head if you wish ? please pm me






Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

1st Mar, 2009 at 08:08:25pm

it does apply to super charging too but too a lesser extent than turboing.

Vmax have used 286's in blown lumps but i think that really is as far as you'l want to go.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Arnoud

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160 Posts
Member #: 1085
Advanced Member

Netherlands

2nd Mar, 2009 at 09:41:43pm

thanks guys,

Hopefully tomorrow I'll have the Longman head (which appears to only have a 21cc champer). I like lumpy a idle so that's not a problem*wink*.
I just ordered 1,100 quid worth of panels for the car (a '76 pick-up), so first things first I guess*wink*

1963 Cooper
1975 Pick Up


Vegard

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7765 Posts
Member #: 74
I pick holes in everything..

Chief ancient post excavator

Norway

3rd Mar, 2009 at 08:43:24am

It's not the lumpy idle that's the problem, it's the overlap.What happens is that you blow the entire inlet charge straight through the engine and into the exhaust because both valves are open at the same time.

This is different to a turbo as the SC provides boost even at low revs whereas a turbo doesn't.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

John

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10023 Posts
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Mongo

Barnsley, South Flatcapshire

3rd Mar, 2009 at 09:19:32am

Listen to the advice from these guys or you could be very disappointed with the end result.

I would highly recommend you take BENROSS up on the offer to grind out the chambers in your cylinder head.
Also if the cylinder head has seen some service it may be advisable to have it refreshed whilst the chamber work is being done.

If something is worth doing, it's worth doing half of.

apbellamy

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16540 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

3rd Mar, 2009 at 10:58:07am

Benross has just enlarged the chambers in my head and done atop job of it. Well worth it.

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

Vegard

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7765 Posts
Member #: 74
I pick holes in everything..

Chief ancient post excavator

Norway

3rd Mar, 2009 at 11:04:22am




On 3rd Mar, 2009 apbellamy said:
Benross has just enlarged the chambers in my head and done atop job of it.




On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

apbellamy

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16540 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

3rd Mar, 2009 at 12:06:44pm

LMAO

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*
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