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Old 05-21-2005, 03:29 PM
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Cam regrind with these heads

Well, the saga continues. My son's 400 STILL won't pass the idle emissions test. I spent the morning doing some carb work to richen it up at idle some and it helped alot, but still not enough.
I"ve tried to no avail to talk him into pulling the cam and sending it back to Comp for a regrind. Here is the run down to the best of my memory.

400, 30 over. 400 crank and rods.
Some fancy name big buck pistons.
Block "0" decked. Quinch is .046.
Cam is "Extreme" Comp roller 282? duration. number is (i think) XR282HR 110 LSA
Roller rockers.
WP 200cc runner heads.
Edelbrock performer Qjet manifold
My super deluxe Qjet carb. LOL
Headers
4.10 gears, 35" tires
TH400 with stock stall.

I'm about to pull the darn cam myself and send it back for the regrind. My question is, if I have it reground to something more reasonable for a 6000 pound truck, will the 200cc heads kill the engine, performance wise?
I was thinking the 262HR would be a much better selection but wondering about that and the head combo.

Any input is greatly appreciated.

Mark

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Old 05-21-2005, 03:59 PM
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Can he not stick a Cat on the truck or does it already have one?

It would be a good comp. to use the cam you want with a high flow cat and be done with it. Thats just me and if this has been said already then sorry

Chris
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Old 05-21-2005, 04:16 PM
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I would try the 276HR. It will give you a little more low end torque, and I think it will match the PRM range of the heads well. My only concern is that it would not do the trick as far as emissions go. Where I live there are no inspections, so I dont know much about what will pass and what will not. As far as performance goes though, I think the 276 may be a better choice considering the weight of the vehicle.


Adam
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Old 05-21-2005, 05:17 PM
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Well, cats are kinda an option. Biggest problem is one header exits right in line with the transfer case crossmember. The exhaust is a real squeeze as it is. Having the cats farther back might not work, may not stay hot enough at idle. Cats may get us through emissions, but the cam is still wrong for the truck. Just need to figure a way to convince my son to pull it I guess.
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Old 05-21-2005, 05:24 PM
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haha no I understand what your saying. Just trying to help you pass the test. If he wouldn't like to run the cats all the time you can get reg. cats (cost less) and run the test. Have them made up like my buddy he got the ends flanged and another straight pipe with flanged ends he can pull it in and out in less then half an hour.

Chris
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Old 05-21-2005, 09:28 PM
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A regrind is going to be cheaper than a different cam?

Why not buy one of the $50 PAW cams just to pass emissions and put the roller back in after it passes?
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Old 05-21-2005, 10:47 PM
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Well, the Comp roller cam is around $300. They will regrind it for $50 plus shipping.
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Old 05-22-2005, 09:28 AM
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Quote:
Originally Posted by Jmark
Well, cats are kinda an option. Biggest problem is one header exits right in line with the transfer case crossmember. The exhaust is a real squeeze as it is. Having the cats farther back might not work, may not stay hot enough at idle. Cats may get us through emissions, but the cam is still wrong for the truck. Just need to figure a way to convince my son to pull it I guess.

My stock 305 Caprice couldn't pass the emissions tests without a catalytic converter. I don't think you're going to either. You need cats.
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Old 05-22-2005, 07:10 PM
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Well Jmark,if I were a criminal,I'd lean the carb out,retard the timing ALOT,create a vacuum leak and turn up the idle screw some.But thats just what I hear.
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Old 05-22-2005, 10:21 PM
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It will be hard to pass emissions without cats especially with that cam. I run a very similar combo to yours and I have a very-distinctive lope with my 282HR that no way I can pass off for stock or even pass emissions in any state. My truck is mostly used for mud bogs and this cam is perfect for my truck and what it does. The 200cc heads are fine in this case as a set of S/R Torquers (170cc) had my motor struggle to get over 4500rpm and the Sportsman heads are deemed smog-legal. As for cam selection and meeting smog laws, you may be run a cam with a overlap of 112-114 to try and meet those laws. Personally, I would talk to the cam companies and see what they recommend. Good luck
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Old 05-23-2005, 11:10 AM
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Well, it did pass today after some more timing adjustments. Guess he's good for another year.
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Old 05-23-2005, 04:08 PM
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... might not be the most ethical thing to do, but why not just bandaid it up? Toss a small carb with some tight jets in it, do up the initial properly and run a couple degrees more advance? The motor isn't checked under load, is it?

K
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Old 05-23-2005, 05:15 PM
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Jmark glad you got it passed. I wonder how far off you had been?? Looks like you'll get away with a tune every year unless of course you and your son start to "make it less enviro friendly"

Chris
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Old 05-23-2005, 05:34 PM
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Its checked on a dyno under load and at idle. I don't like doing it this way either, but thats the way it is. He's on his way over soon and the timing goes back up to where it will run. Bottom line is the cam is just too darn radical for a emission tested vehicle. Personally, I'd like to see the truck go far far away, but he owes too darn much to ever get his money out of it. Best think would be to just make it his fun truck and trailer it to the boonies behind a new Ford PSD! LOL
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