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| Which Cam to Use?; XFI, Delta, 3Tech | |
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| Tweet Topic Started: Nov 29 2009, 12:51 PM (3,796 Views) | |
| Bad Bent | Dec 2 2009, 01:14 PM Post #16 |
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Facetious Educated Donkey
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Suprf1y, I know you have raced and have the skills and knowledge. May I ask how you learned your machinist/millwright skills? Maybe specifically with regard to cams? It's not your way... what makes the way you do it right? It about copying from a perfect original cam, eh? The equipment and procedure? All of the above according to specs? Simply looking for some background, if you don't mind. I happen to agree with you. I'm sure the Delta grind will work, as in not blow up and improve performance. I know there are different combinations of cams and gears, different people doing it "properly" and the right way. |
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| 3tech | Dec 2 2009, 03:42 PM Post #17 |
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What I was referring to, was the way it was parkerized. Bearing journal diameters are important. It's not a good idea to expose the journal to the acid solution, with the end result being material removal, and damage to the surface finish. I don't want to turn this into a 'I'm right, and he's wrong' thing. |
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| Lugnutz | Dec 5 2009, 02:58 AM Post #18 |
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Member
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Okay, one last time and than I will drop out of this thread. I will agree that, in theory, as a general practice, it probably shouldn’t be done. I understand the effects that it can potentially have on bearing journals and the surface finishes. But, since the camshaft journals ride on a thin film of oil anyway it does not even make contact. Sure, somebody could argue that there is a brief moment where the engine is running without oil on startup but, many other moving parts are also affected. And, as we can both agree bad stuff happens any time you have metal to metal contact. As I stated in one of my other replies, I’m not questioning how you run your shop or your techniques. You do things the way you do them and they do things the way they do them. They have been in the same building doing the same thing since the late 1970’s and when Scott can show me boxes of cams on the shelf ready to be shipped that are either partially or fully parkerized or not at all, my guess is that they must be doing something right. That being said, am I concerned with mine because it was fully parkerized? Naa, not really. I’ll have to do a write up with pictures measuring the journals when is comes time for the first Timing belt change. Also, on a side note, I stopped by Delta to pick up two more Xfi cams today and Scott showed me three used factory cams that had been delivered by UPS from customers. One was a Peugeot diesel, and the other one was a set of Acura V-tech cams. Image my surprise when he pointed out that the main journals were parkerized from the factory. Perhaps you should drop Peugeot and Acura an email and tell them they are doing it wrong too…. |
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| nerys | Dec 5 2009, 03:46 AM Post #19 |
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Grr
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ok I will bite what is parkerized? (too damned tired to google it) |
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| Coche Blanco | Dec 5 2009, 11:26 AM Post #20 |
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Troll Certified
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http://en.wikipedia.org/wiki/Parkerizing |
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| dimetrodon | Dec 5 2009, 12:05 PM Post #21 |
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About one year ago, when I was trying to plan the "Weekend Rebuild" of my 1990 Metro, 3Tech was temporarily out of cylinder head cores. So, I ordered a Delta economy cam for the rebuild project, then I ordered the 8 degree timing advance gear from 3Tech. If I had waited a couple weeks, I am sure that I would never have been able to drive the car to Ohio. As it was, when I turned off the car at my final gas stop about two hours from John's house, I had great difficulty getting it re-started. I had to floor the throttle and crank the starter for about 25 seconds before it revved high enough to restart. The car had been progressively loosing compression for weeks so I had to use the parts that were available. So as far the cam is concerned, I have no complaints. In retrospect, I wish I had been able to purchase a 3Tech head because I think I would be getting even better mileage if I had higher compression than I now have. If and when I need to rebuild another Metro engine, I will positively strive for a higher compression ratio. |
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| 3tech | Dec 5 2009, 01:02 PM Post #22 |
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Your mind is already made up, and you already think you know the busieness better than I do, so it makes no difference what I say. Nonetheless, I've been doing this for a long time, and have seen thousands, and thousands of cams, and the first, and only time I've ever seen one like that was the Delta cam. As I have said, IMO, it is unprofessional. If you are shopping strictly on price, buy the Delta cam. |
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| MetroMark | Dec 8 2009, 02:43 AM Post #23 |
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Fresh Fish
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I just had to pop in here and give my 2 cents worth, while you can't argue with success, just maybe there are other ways to do things that are just as correct. I too have seen factory cams with the journals Parkerized. Mainly on OHC aluminum head engines. I have never seen OHV engines that way. If you use a Delta XFI cam and advance it by modifying the stock gear, aren't you going to achieve the same results at considerable savings? When you are modifying a car worth $1500 tops, it doesn't make sense not to experiment with different ways of doing the same thing, especially when it is less money. |
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| john. | Dec 8 2009, 11:36 PM Post #24 |
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Elite Member
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Any detailed instructions on how to modify the cam gear? |
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| Coche Blanco | Dec 8 2009, 11:40 PM Post #25 |
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Troll Certified
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I think it's sort of frowned upon, the guy at 3tech does a good job with them, and 25 bucks isn't bad. |
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| john. | Dec 9 2009, 12:06 AM Post #26 |
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Elite Member
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ok, no disrespect intended |
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| Murf 59 | Dec 9 2009, 01:06 AM Post #27 |
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I have several of his products. And not one complaint. That speaks for its self. I don't have any info on the Delta products. So I can't say one way or another. |
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| 1 user reading this topic (1 Guest and 0 Anonymous) | |
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