Upgrade camshafts
#65
I've got some CatCams here in the UK after contacting them for some clients cars.
I used some of their profiles on a Peugeot 106 I had way back when, it had a decent compression ratio for NA so responded great to a cam upgrade. I'm putting a set of their camshafts in a B6 head for my daily atm along with their own SUBS and spring upgrade. The car currently runs ITB's, long branch primary's and an unrestricted exhaust so hopefully will show a gain!
The specs of the cams are:
- intake: 277°@0.1mm/243°@1.0mm/12.01mm/3.19mm@106°/vc 0.250mm
- exhaust: 269°@0.1mm/235°@1.0mm/11.51mm/2.67mm@-106°/vc 0.250mm
which will hopefully give a bit of a gain on my standard bottom end, I'm planning on running a turbo at a later date so will play with cam timing when the time comes.
I'm lucky enough to have a dyno here on site so will update with some RR graphs on the same setup stock cams vs the above.
Dan
I used some of their profiles on a Peugeot 106 I had way back when, it had a decent compression ratio for NA so responded great to a cam upgrade. I'm putting a set of their camshafts in a B6 head for my daily atm along with their own SUBS and spring upgrade. The car currently runs ITB's, long branch primary's and an unrestricted exhaust so hopefully will show a gain!
The specs of the cams are:
- intake: 277°@0.1mm/243°@1.0mm/12.01mm/3.19mm@106°/vc 0.250mm
- exhaust: 269°@0.1mm/235°@1.0mm/11.51mm/2.67mm@-106°/vc 0.250mm
which will hopefully give a bit of a gain on my standard bottom end, I'm planning on running a turbo at a later date so will play with cam timing when the time comes.
I'm lucky enough to have a dyno here on site so will update with some RR graphs on the same setup stock cams vs the above.
Dan
#66
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Its not unusual for engineers to design a profile coupled with the right valve spring to utilize "valve lofting", in which at a tuned rpm range the valves will "loft" off the profile. Its a way to get variable lift and duration.
It has proven to lead to accelerated wear on the cam and lifters, too much so for OEMs to utilize in street cars, but its plenty reliable for race engines that get torn down frequently.
#68
Non-interference
Valve-piston contact at zeroed cam timing
Flow available in a stock head
Reasonable setup with available spring kits
...
11mm starts to be a lot on the BP IMHO (for a number of reasons).
Unsure what clearance there is on a zeroed cam with 9:1 Cast Mazda Pistons on an undecked block.
#74
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Stock VVT cams are 9.4mm VVT head castings will take 10mm cams on the intake side, but not on the exhaust side. I seem to remember the 6D castings having more clearance than the 4W castings did on the intake (the exhaust cams are all the same, but 4W lift is only .326 to the 6D's .370), but that might just be in my daydreams.
#75
Stock VVT cams are 9.4mm VVT head castings will take 10mm cams on the intake side, but not on the exhaust side. I seem to remember the 6D castings having more clearance than the 4W castings did on the intake (the exhaust cams are all the same, but 4W lift is only .326 to the 6D's .370), but that might just be in my daydreams.
More space for the spring/lash setup is another advantage.
#76
does any one have experience with re-grinds? Before i put my engine into my new chassis I'm going to be replacing the Integrals with something more tame, Im either going to contact Web or Kelford. Im a little skeptical about having web regrind my stock cams vs a new cam from Kelford. But i like the idea of using someone in the US to do my cams so i can stay in contact with them easier.
I will be doing something in the 220 duration @ .050" range and as much lift as i can run with out getting really extreme with the ramps.
I will be doing something in the 220 duration @ .050" range and as much lift as i can run with out getting really extreme with the ramps.
#79
I went with cat cams for my custom cams. I can't say enough good things about them. They kept in constant contact with me throughout the whole process and will make you a custom billet cam with whatever possible specs you ask for. Matthew is the guy you want to talk to over there. Great customer service.
#80
I went with cat cams for my custom cams. I can't say enough good things about them. They kept in constant contact with me throughout the whole process and will make you a custom billet cam with whatever possible specs you ask for. Matthew is the guy you want to talk to over there. Great customer service.