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Gnarls.
are you on a Valium drip?
No but that sounds pretty good right about now
Are you having anxiety about your rebuild?....
This motor is so quiet I can finally hear every OTHER noise my truck is making
Geez Gnarly, why didn't you tell me the FSM doesn't have any cam specs in it?I finally found one for a not-too-outrageous price and was looking through it today. No mention of cam specs at all except how to measure lobe height, which really doesn't tell you anything except how to check if a lobe is worn. No duration, no lobe position, nada. Bummer.
Well I'm not at all disappointed I bought it. Way better than the Haynes manual I've been working from. The detailed diagrams of the emissions and electrical systems are worth it just by themselves. I now know how the HAC works!When I was blathering about cams earlier I mentioned that I thought the specs would be in the FSM and was surprised they were so hard to find. If you said they weren't then I missed that. Not really blaming you man, just flinging poo to stir things up. I've seen factory cam specs on the web but where did they come from? How do we know they're accurate? The fact that one source I saw showed the carb and EFI cams having basically the opposite specs of each other for the intake and exhaust lobes has me wondering. That's why I was hoping the FSM would have that stuff in it as Toyota would be the ultimate authority on this stuff. The GM service manuals from the late 60s and early '70s that I have contain much more information about the various cams including duration, lobe positions, and lift so I was kind of thinking Toyota would do the same thing.Oh well, hope you're having a good weekend!
As far as heads and porting go......
Hey Gnarly,Have you looked at the Crower cams? Crower makes high quality stuff. Some interesting grinds here. Notice the wide LSA for EFI vs. narrow but requiring high compression for carb:https://www.crower.com/camshafts.html?cat=1068Hmmm, and I just went and looked at the Schneider cams. They have wider LSAs for the EFI applications vs. narrower for carb, too.Thing is, there's no reason you couldn't run the wider LSA in a carb'd engine. Spreading out the lobe centers increases vacuum and idle quality and decreases overlap. It tends to flatten the torque curve. Honestly, I'd rather have a fairly flat torque curve with more torque down low than go for peak torque and give up torque down low."Area under the curve" is where it's at for a truck you drive a lot.
..... When I was blathering about cams earlier I mentioned that I thought the specs would be in the FSM and was surprised they were so hard to find...
Some of the aftermarket "stock" replacement cams have a little data available. Look on ebay and such and you will find some that list lift and duration, etc.
Why not find someone you can ship it to and have them tell you?
So what are those specs?
I just sent Jim at 22re Performance a bunch of cam and rocker cores and he is sending me I think his 272 grind and some valve springs. Supposed to be a higher rpm profile. I plan to use it on my "pinky" 20R/22R build, which will probably be next year...
I've measured and calculated the base circle and max lobe lift and the cam from my 22RE is spot on.The Engine Analyzer software will calculate other specs.Gnarls.
Am I missing something? How can a program possibly calculate duration and lobe position specs from nothing but base circle size and lobe lift?I'm going to have to figure out how to mount my degree wheel to a 22R. That would be the best way short of an actual cam grinding machine to get meaningful numbers.Went on a 4-day camping trip last Thurs - Sun and it showed I still have work to do on the Xtra cab - the engine sounds like it has timing chain slap, it tried to overheat going up Snoqualmie Pass, and 5th gear started making noise. If I'm going to do the timing chain, might as well get the degree wheel on there and see what it can tell me about the stock cam.
Magic!Gnarls.
LOL... but seriously...
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