Cam Choice in 4.6 build - Defender Source
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Old January 28th, 2010, 11:44 PM
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Chris Davis
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Cam Choice in 4.6 build

As I rebuild my engine, I am re-examining my choices in build up. The two outstanding questions I have are the cam and the timing gear.

The cam choice is really between the Crower 50227 and the 50229. I am running the 50227 now and love it--very low end torque. The only downside is I wouldn't mind some higher RPM's at times (redlines around 4500) as it doesn't sound smooth over close to 4000 rpm. I rarely go that high, though. I hear I may not give up too much low end toque going to the 50229 and that it rpm's much better (reds around 5500). Have any of you tried both cams? I am running a R380, 33" tires, stock diff gear ratio.

Question #2 is the timing chain/gears. Looking at the Cloyes 9-1132 ($55) and the 9-3132 ($120) (links below). I figure some of you will have used Cloyes sets--I would love to know if there is a compelling reason to use the 9-3132 as it seems the other would be sufficient and then some at 1/2 the price--somethings are worth it and I just don't know if this is one of those things. If you have experience, please let us all know.

thanks,

Chris
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Old January 29th, 2010, 08:16 AM
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Ive got the 230 in my 3.9 rrc with the auto and it pulls 235's along no problem at least untill the torque converter locks up. The power falls off around 3k. I am using a pro-gear timing chain, it was what D&D sells. He talked me out of the double roller chain. As far as redline thats controlled by the computer, I think a lot of those Crower <230 are cut for low end power anyways. I am getting the parts together to do the 230 in my D-90, should be a lot more enjoyable with the 5 speed. D&D can set you straight he has been building these engines for a few years.
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Old January 29th, 2010, 10:22 AM
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Chris Davis
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I would be very curious to know why he talked you out of the double roller chain?
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Old January 29th, 2010, 07:29 PM
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Gary
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Quote:
Originally Posted by Davis View Post
...The only downside is I wouldn't mind some higher RPM's at times (redlines around 4500) as it doesn't sound smooth over close to 4000 rpm. I rarely go that high, though. I hear I may not give up too much low end toque going to the 50229 and that it rpm's much better (reds around 5500)...
Just curious. Given it is a Defender, in what driving situation would it be beneficial to have the ability to rev to 5500 at the expense of even a little low end torque?
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Old January 30th, 2010, 11:17 AM
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Chris Davis
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It is not that you would ever rev to 5500, that is just the redline. What I was more interested in was the movement of the power and torque curve itself to a higher rpm level--although the redline itself does not represent the where the power cycle falls, it is usually indicative somewhat indicative of "positioning" of this band at least when comparing good aftermarket cams. For instance, with the 50227 with a 4500 rpm redline, the power is really right off idle to about 2000 rpm and the engine starts not liking it too much when you are over 3000rpm. With the 50229, your power curve is more 1500-3000 with the redline closer to 5500 so if you hit 3000, like going up hills in the Colorado mountains in lower gear, the engine would have more power and feel smoother.

My thought is that, although I love having the very low end torque for off roading, I would switch to the 50229 cam to get better broad band power/torque as long as I don't give up too much low end grunt.

I see why you would think I was actually referring to hitting the redline--I hope this clarifies my intent.

Cheers,
Chris
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Old January 30th, 2010, 06:53 PM
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229/230 D&D said the 229 was not much more aggressive than stock.
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