6 replies to this topic

[racingbob]

according to vizards book the mg metro cam and 1.5 rockers work very well

very slight loss in power down low ( but probably not noticable )

but good difference in mid range and high end

and worth using

any other advice from anyone particulary using them

[Mal_whitby]

I've just done 500 miles, in a 1330 engine with the MG metro cam and 1.5 rockers (non roller ones). I've started flooring it occasionally and it goes really well, I haven't noticed any real loss in bottom end, it still cruises around town in fourth gear at 25 - 30MPH on a 3.44 diff. The compression is quite high at 10.5:1 so maybe that (and the overbore) helps with bottom end.

It's also a really good combination for overtaking, can drive along at 50MPH behind a slower car, floor it in fourth and it picks up really well. I've never had it to 5000RPM yet, and lets be honest, how often does a road car go to those RPM. Mid range is infinitely more important in a road car and the cam and rocker combination is really good for that.

[Cooperman]

I did a test on an engine with a 286 cam and twin H4's. It gained 2 bhp when I switched from the original 'S' forged rockers to 1.5:1 roller rockers, but only above 5700 rpm. Although not measured, it did appear to lose out at the bottom end.
Of course, it may be different with a softer cam.

[racingbob]

I've just done 500 miles, in a 1330 engine with the MG metro cam and 1.5 rockers (non roller ones). I've started flooring it occasionally and it goes really well, I haven't noticed any real loss in bottom end, it still cruises around town in fourth gear at 25 - 30MPH on a 3.44 diff. The compression is quite high at 10.5:1 so maybe that (and the overbore) helps with bottom end.

It's also a really good combination for overtaking, can drive along at 50MPH behind a slower car, floor it in fourth and it picks up really well. I've never had it to 5000RPM yet, and lets be honest, how often does a road car go to those RPM. Mid range is infinitely more important in a road car and the cam and rocker combination is really good for that.

what about wear on cam using the 1.5 for road use

only had them on race car

[bmcecosse]

Personally - I would not use the 1.5 rockers - the small gains are far outweighed by the disadvantages......... The MG cam will be fine on it's own.

[carbon]

I've recently changed from std rockers to 1.5's on a 1293 with MD266 cam - the profile and lift on this is very similar to the MG Metro cam. Very pleased with the result, much more responsive than before at the top end. There is a slight loss of low-down grunt below about 2000rpm and tickover is a bit lumpier but not too rough, still needs setting up properly.
Both the MG Metro cam and the MD266 are probably a little low on cam lift when compared with a lot of the other grinds now on the market, in particular where used with a 1275.

[dave-88_123]

it should be a very good combo with a mild cam watched a janspeed video on youtube they used them with a kent 266 and the engine made loads of power