Mike Satur VVC Cams - RR Results

As some of you will have read before; I have been changing parts on the TF and then taking it to the same Rolling Road each time to see if they have made a difference. The aim is to see a factual result of each change that may also help others with their cars too. :broon:



I will piece all of the results together into a single thread in the future but for now so that each change can be commented on I'll start a new one.



Previous thread here: http://ift.tt/1zrvdOS



This time I have bought some Mike Satur spec reground vvc cams - the set of 3 can be found here on Mikes page:

http://ift.tt/139pIaR



His spec:

Inlet cam 270° duration and 10.08mm of cam lift.

Exhaust Cam 260° duration and 10.16mm of cam lift



They were fitted by a garage I trust, belts were changed at the same time. Mike suggests that they should be timed up as normal.



The results:



Before 160.4bhp 131.1lbf.ft - after 160.0bhp 128.8 lbf.ft



Before Graph:





After Graph:





The results in my opinion are not good... however this is also the point of doing the tests. So how to improve:



The Rolling Road engineer suggested verniers were needed with different cams to adjust the timing as needed, once explained that with the VVC you cant use verniers he suggested timing dowels. (an email has been sent to Dave Andrews to request his advice (and cost) for these as I know he recommends them for the piper exhaust cam). A little experimenting might be needed to find the correct ones but once found I'm sure others could then order these separately for theirs.



I contacted Mike by phone to ask him for advice about the cams results and if he would like me to bring the car to him to check over (3hr drive) as he knew that I would be posting the results on here and I wanted to give him the chance to see for himself; sadly he said that he wouldn't want to check it and that he has sold many sets and that people could feel the difference.

I have to say that I am disappointed in this response, especially considering that both of my TF's have had a great many of the items in his online shop.... I thought a little loyalty to his customer might have shone through. Any way I digress. I have also emailed him the graphs and asked again if he would like me to come to him - I have not heard from him as yet :(



I did not do the 160 air box vs the Maxogen simply because after seeing the results of the cams I didn't want to spend another £76 on another run I'm afraid. I will do this once I have either dowels or any good suggestions from yourselves!



These are the results from the same TF and engine; other engines may differ.



Please let me know your thoughts and any suggestions.



Helpful email from Dave Andrews with suggestions:

Quote:

That must be frustrating. The exhaust cam I fit is 264 degrees rather than 260. I am not a great believer in reprofiling the VVC cams, I am slightly puzzled at the quoted duration of the cam as the VVC normally varies from 220 degrees to 290 degrees by varying the speed of the cams rotation during the open and close periods. The normal way of extracting extra power is head work, and uprated exhaust cam and retiming of the mechs using offset dowels. I would check the timing by measuring the lift at TDC on both inlet and exhaust, when fully retracted the VVC should give around 5 thou lift at TDC and the exhaust cam around 50 thou. However it is not uncommon for the latency in the system to result in retardation of both cams by 6-8 degrees, this will mean the lift at TDC is less on the inlet and more on the exhaust. The offset dowels advance the front mech and the exhaust cam (which in turn advances the rear mech via the rear belt).

from the last news http://ift.tt/1zrvcdI

via IFTTT