ZEN Performance

You obviously need to look closer. You should be able to build a set of 99-00 from the parts you already make to build the other pulleys.

Lateral Performance

iTrader: (20)

I think people also need to know, that to fit these, and set the timing up correctly, it's really an "ENGINE OUT" job.

It's also a job that needs to be done by someone with the right timing tools, and who knows exactly what they are doing.


Mark.

cdfracing

Yes i should of stated this ...

These do need to be installed by a professional mechanic it may cause severe engine damage if not timed correctly .

cdfracing

Sorry but I won't be able to check untill i recieve some, I have been told that either the pick up sensors or the keyway is different . If they were all the same then yes - but they are not.

chris

cdfracing

Finished some 02-05 cams today , These are Very light! weighing around 400 grams each

ZEN Performance

they will crack.

cdfracing

Please explain why you believe this ?

cdfracing

I dont really understand why you have a problem ?

I know you have a very good rep on here so I don't really want to argue and appreciate your comments, however

We have been making pulleys and gears since 1988 .. we know what we are doing, do you really think any one would sell such a product if they didn't feel they were save? I could post a very long list of happy customers for all type's of timing pulleys ,gears,sprockets.

I must admit I would recommend to have these Hard anodised ... but even if they weren't they would not crack or break,, some older models use Bakerlite cam gears and they would shatter if dropped from a foot ..

is it not alloy cams your are running on your car


Chris

stevepulleyman

I have some lightweight ally cam pulleys on my car made by chris, and they have been on my car for over 12 months now. I had my engine out just recently as my head gaskets blew, so while the engine was apart i had the heads ported and polished etc and other goodies added etc, and when i re-built the engine back up, i cleaned everything off etc, to inspect etc, and the cam pulleys showed no signs of cracking or anything else untoward, and still looked as good as new.(see photo's on this thread)
When going for bigger power outputs alot of builds do away with the bakerlite pulleys and revert back to steel cam pulleys or lightweight ally ones for extra strength as in my case.
These pulleys are made to a very high standard and i would'nt have put them on my engine in the first place if i ever thought there would be a problem. Keep up the good work chris, top quality as always.

ZEN Performance

I didn't say they aren't made to a high standard, they look very nice.

They look like copies of the Kent pulleys, and if they are the same as the kent pulleys, they have a very good chance of cracking. And since cracked kent cam pulleys have resulted in the failure of at least one engine, I would want to be sure about what you're doing. The later design of kent pulleys (of which I have the only set AFAIK, along with an original set) are somewhat different. The kent pulleys also had steel threaded inserts for the adjustment screws, and top hat style thick washers under the heads to spread the load. They also rub the rear cambelt covers and using screw heads for cam pickups is a recipe for an engine that doesn't work.

I don't want people to have failures, but I'm not here to do your job for you.

cdfracing

Been waiting your reply off too sleep now,


These aren't kent cam pulleys , I have also heard about problems with theres .

I haven't fitted the grubs yet as I didn't have enough in stock , We could use the button head type or we can countersink the flange to make them flush, These are based on a usa design but the other version will be our own design from steel cams , just drawn up to make them adjust,
I take it you mean about the thread ripping? If the body was hard anodised they would be okay .. not sure what you mean by the new kent ones? Like a press in type thread?

Also the pickups have been milled on these pulleys ... They were turned.. then gearcut then milled allowing the toothform tobe complete to the end of the top inlet pulley ,


If your interested in checking out a set of these or testing them please give us a shout ,

Cheers chris

ZEN Performance

The problem is with the RH pulleys, and their very deep dish, it puts a lot of load on the hub, and the kent ones cracked around the slots which weaken it further. My recommendation would be to make the RH hubs from steel.

cdfracing

Do you mean the insert parts or the pulley itself? we could make them out of stainless no probs,

ZEN Performance

The inner part of the pulley, that is bolted to the cam.

cdfracing

Yes not a problem , i'll make them if we get the interest

Lateral Performance

iTrader: (20)

Chris,

Don't take some of Paul's comments out of context.

Many of the tuners have had some experience of Kent adjustable pulleys failing.

I'm sure that Kent would claim they are very experienced at making pulleys, and work to very high standards.

In fact, every company will make this claim about their products, just before they have a problem.


Paul is not questioning your abilities to make a good product, but good products come from experience, and input from the people who actually use them.

I would double check everything on the OBX pulleys, against an OEM set, because I've heard of fitting issues.


Mark.

Dill_typeR

You could make a rig with pulleys on it and run an electric motor on it to test them, check em with dye penetrant or similar for stress and cracks, would be cheaper than knackering an engine, if thats the outcome of a pulley failing?

cdfracing

Mark,

Im not one of these guys that thinks my way is the best.. im all up for you guys to point us in the right direction and to tell me about previous issue's etc.. I do think it is a good idea to about the stainless centre's, and the stainless threaded inserts,

The cams we will be making will be for version 3-6 and we will be making these from stock non-adjustable pulleys, these will be copies from them but adjustable .. so these will not be able to fail as all the size's will be the same in every way- if you know what I mean,


Gotta get enough interest in them though for those prices,


Chris

ZEN Performance

You can get commerciall available steel inserts for the threads, with sufficient depth even a helicoil is going to be better than just plain aluminium.

This thread isn't really the place for the R&D to be done, if you would like some assistance in making sure the pulleys will be 100%, then i am sure we can work something out!

borat52

I'd be in for a set for some sti4 heads

93-97

1. Borat52 (sti4)
2
3
4
5

02-05

1
2
3
4

S,M,G

CDF

As Paul says there has been issues with the centres, i have had 2 sets fail resulting in bent valves, and buggered covers. The trouble is that you get a pulse as the cam turns due to the slots and further inhanced by the backward overhang this becomes a stronger pulse, so the thing is trying to twist if you like. The more you adjust them it gets stressed again the steel insert that paul speaks of used to push hard into the corner of the machined part no RADIUOS made for a week part. I remade these parts with a big radious and they have been fine on three engine mine 850 bhp +++ mikees 640bhp and Andy Tatts manx hill climb winning car so i guess you could say theres a little testing done there. I do not intend making any pulleys only done the ones i had to, just to get the cars out there. I could be interested in some pulleys, well a good few but they need to be right. I have some broken ones still and i will be doing the refresh on mikees very soon so could supply you with the ones i made as a pattern. If your interested email me smgtuning@hotmail.com

Steve

cdfracing

Hi STeve,


Yes I totally agree with what has been said .. We shall be making these with either 5 or 6mm helicoil stainless threads and stainless centre's ,

Shouldn't be too long before I have a set on a version 4 engine for testing

evander

iTrader: (1)

Will these pulleys fit all classic engines? The reason I ask is because I am running a 95 uk engine at the moment and have a 93 wrx engine sitting to be rebuilt and installed when the 95 gives up. I dont expect this to be any time soon though, I may even fit sti heads on the rebuild.

ZEN Performance

I've just noticed the machined cam trigger teeth. The teeth NEED to be steel.

cdfracing

The first ones we done a couple of years back had steel pins like the way the bakerlite ones were made , but the sample's for the 02+ ones were milled out of the ally ..

I know what your saying about the magneti pick ups but how can other companys make them in ally? I first thought that maybe it was just a passing sensor?

chirs

ZEN Performance

I give up.

cdfracing

All I am asking is if you knew how other manufacture's can make them in ally and it works for them ? obviously you dont know .

ZEN Performance

It works? You have the most to lose if it doesn't, like I said at the very beginning, get them well tested, currently they may not even fit, and if they do they will not start the car.

cdfracing

Don't worry... these will be tested before they go on sale, They will also have stainless inserts , helicoil threads , steel sensors.

chris

cdfracing

93-97 adjustable cams.


Right we are getting there . Nearly finished our sample set which are due to go for some hard testing at and on a 600bhp sti version 4.

We have made these with some thick 316 stainless steel for the inserts, there is no way these will crack - in fact they will be stronger than the standard cam which are made from mild steel . Each cam also has 5 stainless helicoil threads which will never ripp.

Now we have to have them hard anodised . Made Flange's to suit . Mill the timing marks on and insert the Steel trigger sensors. Key the centre's


Few pics.












Chris