11 replies to this topic

[Mrpeanut]

I'm about to start a rebuild of an mg metro short engine. It appears to be a low miler so I'm assuming the mg metro cam will be fine. If its not, I have another mg metro cam.

My question is whether I should stick with the metro cam. Would a 266, 276 or sw5 be better?

The engine will be mated to a decent ported head and hif44. Dizzy will be DM65. Box standard.

I drive mostly at weekends, round the lanes. I'm not rev heavy and prefer low to mid pull over top end grunt. In fact I rarely see over 4k socwant my fun under that.

One more thing, I have a choice of 3.4 or 3.1 final drive. I'm leaning towards the 3.1 but will go 3.4 if it gives a better balance.

I'd appreciate any thoughts, thanks.

[Cooperman]

If you never go over 4000 rpm then a 276 is most certainly not for you because it gives peak power at about 6100 rpm. With the MG Metro cam peak power is about 5700 rpm and peak torque at about 4100 rpm, plus or minus a bit, so the MG Metro cam is about ideal. The 266 is virtually identical to the MG Metro cam. I've not worked with the SW5, but it must be similar.

FDR is personal choice depending on whether you want more acceleration or a better cruising rpm at a given speed. A 3.44:1 will give about 66 mph in top at 4000 rpm.

[Tupers]

I'd go with the SW5. my local engine builder raves about them.

[Mrpeanut]

Cheers for that cooperman. I've read different things about the sw5. My suspicion is that it's similar to the mg metro but I'd love to know an opinion from someone who's used both. You've confirmed my thoughts on the 276.

Fd bothers me. I want to floor it and feel it!

[Mrpeanut]

I'd go with the SW5. my local engine builder raves about them.

Does your man say why he likes it so much?

[Tupers]

I think low end torque and drivability where his key points on it. He was only on the phone to Dad today talking about one they'd recently installed on an MG Midget. 

 

He runs Tipton Garage with his son down here in Devon.  Richard the owners used to work for Downton and his son used to work in the engine department for the NIssan BTCC team when they where running Primera's. 

[Mrpeanut]

The mg metro gives peak torque at 4100. Does any cam give peak torque lower down whilst giving decent overall power?

[Mrpeanut]

I think low end torque and drivability where his key points on it. He was only on the phone to Dad today talking about one they'd recently installed on an MG Midget. 
 
He runs Tipton Garage with his son down here in Devon.  Richard the owners used to work for Downton and his son used to work in the engine department for the NIssan BTCC team when they where running Primera's. 

That ties with what I've heard, thanks. I'm persuaded its a great cam, as is the 266 and mg metro.

I'd love an opinion of the real world differences if anyone has experience.

[mk1leg]

yes I agree with Tuppers as I have an SW5 in my engine and the low end torque is brilliant and of course the mid and top are fab..............

[ACDodd]

Yes the sw5 has much less overlap lift than the mg metro cam. This means more low end pull, torque point 3 to 3.5krpm. My own ACD - RT cam is similar with a slight bias toward low end pull. Both cams will match the top end pull of the mg cam as they both have higher lobe lift which basically extends the top end of the rev range. The sw5 and ACD -RT are in no way similar to the mg cam in specs. Just as the mg cam and the Kent 276 are also two very different beasts!

In order to successfully compare to profiles you need to look at the overlap lift, lobe separation and total lobe lift figures. If these are the same the cams are going to give you the same characteristics.



ACD

Edited by ACDodd, 22 May 2013 - 06:43 PM.

[Mrpeanut]

Cheers chaps, that's helpful. The mg metro cam is going!

AC, sw5's are pricey. How much is yours? Pm me if you could please.

[ACDodd]

All my cams are £105 exchange, 6 in the range from stock to sprint,

 

PM sent.

 

AC