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Oem Camshafts


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#16 Retroman

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Posted 12 May 2018 - 12:25 PM

I'm looking at doing a rebuild of my 1100 and was looking into other mini engines as a comparison to output figures.   Looking at the 997 cooper engine which has almost the same compression ratio as to my 1100, same head and I will be running the same inlet and exhaust, the figures are around 55hp and 54lb-ft of torque.   My 1100 out of the factory has 48 hp and 60lb-ft.   The extra torque cam be explained by the longer stroke and the camshaft explains the extra hp.   

 

But then I look at the lower spec 1275 engines and they have almost the same horsepower and torque figures as the 997 cooper engine but with larger bore.   But the head is an open chamber with larger valves.   

 

So basically my question is that are the Leyland camshafts originally fitted quite poor performance wise and if replace the 948 camshaft in my 1100 to one such as a minispares Evolution001 camshaft, MD266 or RE266ss will the power figures produce any real difference?

 

Thanks for your advice.

 

Yes you will notice a good difference but more with a head change 12g295 or 12g940 probably with pockets in the block.

 

More CC's is also cheap power, a 1098 ca go to 1217 now with 68mm pistons, it also makes the engine more square (more equal stroke and bore.

 

The dyno graph below is a 1107cc mongrel with a 998 crank 68mm pistons and a 12g940 head vizarded HIF38 270 cam.

 

 

M0oPUgl.jpg

 

The flat torque curve from 3 to 6k makes it really nice to drive, and its about twice the grunt of a std 998.

 

Perfect for the road with a real smile factor the guy loves it.



#17 hhhh

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Posted 12 May 2018 - 02:23 PM

is it slarks when at amsebury or new dyno at Bristol

 

Sorry, don't know. I borrowed it from another thread with "100HP" in the title if you want to search for it.



#18 Chris.Williams

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Posted 12 May 2018 - 10:40 PM

I'm looking at doing a rebuild of my 1100 and was looking into other mini engines as a comparison to output figures.   Looking at the 997 cooper engine which has almost the same compression ratio as to my 1100, same head and I will be running the same inlet and exhaust, the figures are around 55hp and 54lb-ft of torque.   My 1100 out of the factory has 48 hp and 60lb-ft.   The extra torque cam be explained by the longer stroke and the camshaft explains the extra hp.   
 
But then I look at the lower spec 1275 engines and they have almost the same horsepower and torque figures as the 997 cooper engine but with larger bore.   But the head is an open chamber with larger valves.   
 
So basically my question is that are the Leyland camshafts originally fitted quite poor performance wise and if replace the 948 camshaft in my 1100 to one such as a minispares Evolution001 camshaft, MD266 or RE266ss will the power figures produce any real difference?
 
Thanks for your advice.

 
Yes you will notice a good difference but more with a head change 12g295 or 12g940 probably with pockets in the block.
 
More CC's is also cheap power, a 1098 ca go to 1217 now with 68mm pistons, it also makes the engine more square (more equal stroke and bore.
 
The dyno graph below is a 1107cc mongrel with a 998 crank 68mm pistons and a 12g940 head vizarded HIF38 270 cam.
 
 
M0oPUgl.jpg
 
The flat torque curve from 3 to 6k makes it really nice to drive, and its about twice the grunt of a std 998.
 
Perfect for the road with a real smile factor the guy loves it.
That looks like a lovely road engine, plenty of poke..... I really do think the 1098 engine gets a lot of undeserved bad press.
It may not be a rev machine but they have mountains of torque, that's where the fun is at.

#19 70K1100

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Posted 14 May 2018 - 10:15 AM

I've got a standard 295 head and a flowed head which needs to be finished off.   But looking at saving a few dollars I was looking at just a cam change to a more modern cam shaft.



#20 Retroman

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Posted 14 May 2018 - 10:33 PM

The flowed 295 with any of the 3 cams you were thinking of will go well

 

I assume you are running a single HS4



#21 70K1100

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Posted 18 May 2018 - 08:09 PM

I have a set of twin HS2s on a factory 997 cooper manifold with a maniflow freeflow exhaust manifold.   I also have an accuspark black box with a 25d distributor.



#22 Retroman

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Posted 24 May 2018 - 08:55 PM

The twin HS2's have a place on an original Cooper or S

 

I would go with a single carb HS4 or an HIF38 (preferably Vizarded)  on a good alloy manifold they will be better all round.



#23 70K1100

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Posted 06 June 2018 - 04:08 PM

I was looking at a HIF38 on a minispares manifold.   Mostly because it would be a lot cheaper to setup on a set of rollers.






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