I ran a Downey Cam and header on a 22re in a 4 runner. They didn't really seem to do much for it. If I get another 22re truck, I won't get the same stuff for it again.
Aftermarket Performance 2F Cams
- Thread starter RUSH55
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Mark W
Yep, I really don't really care that much I guess.
RUSH55 said:
Those are strange sounding numbers. There is no reaon for the longer duration camshaft to have less lift. I *think* that that cam has about .450 lobe lift.
As to "the stock Landcruiser duration is ridiculously too long"... They're smoking something. IIRC the duration of the stock cam at .050 lift is something along the lines of 190 degrees. Regardless it is NOT longer than the cams they (and others) offer. If it was, then a) it would also have more lift, or B) the regrinds of stock Cruiser camshaftsd would have onger durations available AND more lift, and c) the stock cam would out perform theswe aftermarkets in midrange and top end.
A LOT of thge stuff that Downey claims about various products they sell simply won't hold up to an encounter with reality.
Mark...
Mark W
Yep, I really don't really care that much I guess.
RUSH55 said:
The cam range I like is the one that downey lists as their 224 degree (that is measured at roughly .050 of lift. Clifford used to sell this grind as a "260" duration cam and the one I uses is sold as "262" degrees (this measurment is total duration). MAF has a similar cam. Specter *may*, I don't remember right now. All of these will give you pretty comparable lift (in the low to mid .440 range) The limiting factor in how much lift you get from the cam is directly related to the size of the base circle. A smaller circle has to have a steeper lobe than one with a larger base circle. The steeper lobe puts more stress on the material of the cam and the lifter. Anyway for the same engine, most cam makers will have similar duration:lift relationships.
The C series is an Offenhauser 4 barrel intake manifold.
Mark...
Mark W
Yep, I really don't really care that much I guess.
jmaddox said:
That's just Downey making a few extra bucks. The factory valve springs will work fine to above 5000. I've run them to 6000. Few people will be pushing a 2F that high.
Mark...
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Mark W said:
Thanks Mark.
That's what I figured. Anyway, I ended up getting new Toyota valve springs and since I got over 300,000 miles out of the old set I won't worry too much.
John
RUSH55
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- #26
Well, I figure any company is gonna tell you whatever story they can to fool you into believing they have a superior product, that's their marketing angle. The challenge is to read thru the BS to find out if the product lives up to the hype, or IS just hype. I want something that's gonna make me physically feel a difference when this is all said and done.
-A smaller circle has to have a steeper lobe than one with a larger base circle. The steeper lobe puts more stress on the material of the cam and the lifter. -
This was something I was also curious about and would have questioned the manufacturer about before purchase- that is if it was a new grind or a regrind. But I do know that there are alot of perf. people out there running regrind cams (I just recently learned how that works), but I'm just trying to visualize how this is worse. Either way (new grind or regrind) the lifter still has to travel the same amount of total lift from its base and keep the valve open for the same amount of time (duration). In my head it's the same, either large or small. It's still the same amount of stess isn't it? If the base circle is smaller with a larger lift, I can see how that would stress and wear the lifter and valvespring differently than that of the stock grind. But if you have a new grind with the same higher lift, wouldn't it still be the same stress on the components, and if not, wouldn't the duration be different?
-A smaller circle has to have a steeper lobe than one with a larger base circle. The steeper lobe puts more stress on the material of the cam and the lifter. -
This was something I was also curious about and would have questioned the manufacturer about before purchase- that is if it was a new grind or a regrind. But I do know that there are alot of perf. people out there running regrind cams (I just recently learned how that works), but I'm just trying to visualize how this is worse. Either way (new grind or regrind) the lifter still has to travel the same amount of total lift from its base and keep the valve open for the same amount of time (duration). In my head it's the same, either large or small. It's still the same amount of stess isn't it? If the base circle is smaller with a larger lift, I can see how that would stress and wear the lifter and valvespring differently than that of the stock grind. But if you have a new grind with the same higher lift, wouldn't it still be the same stress on the components, and if not, wouldn't the duration be different?
Mark W
Yep, I really don't really care that much I guess.
Picture a beach ball spinning in a circle. It has a "lobe" which gives a total duration of 90 degrees of the balls rotation. It has a total lift of .500 inches.
Now picture a marble with a lobe that generates the same lift over the same amount of rotation.
The ramp section of the lobe is subjected to a lot more contact pressure in the case of the small circle than in the case of the large.
Mark...
Now picture a marble with a lobe that generates the same lift over the same amount of rotation.
The ramp section of the lobe is subjected to a lot more contact pressure in the case of the small circle than in the case of the large.
Mark...
Mark W
Yep, I really don't really care that much I guess.
Don't think so. I'll check.
Mark...
Mark...
Offy
Anyone interested in one-----
Poser said:
Anyone interested in one-----
Offy
pics
pics
PabloCruise
SILVER Star
ttt
PabloCruise
SILVER Star
Mark,
Don't you offer a regrind? Specs?
What intake/exhaust options exist if I want to keep the Aisan vs a 4 barrel?
Don't you offer a regrind? Specs?
What intake/exhaust options exist if I want to keep the Aisan vs a 4 barrel?
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RUSH55 said:
Mark W
Yep, I really don't really care that much I guess.
PabloCruise said:
I'm just about to restock a new batch of regrinds. I usually stick with a single grind that works better for me than the rest. 262 advertised duration, 214 at .050. 441 valve lift IIRC (I'd have to check, I don't have any numbers in front of me right now).
Any of the cams adverttised with similar duration will be pretty much the saem thing.
This cam also works very well with a late model Aisan on top of the large runner facgtory manifold (if you can find on). VERY well.
Mark...
RUSH55
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- Thread starter
- #36
jmaddox, I haven't got my mind set on any particular brand yet. It's gonna be awhile before I buy a cam anyways. I need to get some machine work done first. But be sure to keep me posted on your cam.
Grant, did you get my PM?
Mark, how much do you charge for your cams?
Grant, did you get my PM?
Mark, how much do you charge for your cams?
Mark W said:
Hijack....
Mark, is there any header that will work with the large runner factory manifold? Or should it be mated to the F exhaust manifold? Seems like the runners are sufficiently thick as to prevent the use of most headers.
Ed
PabloCruise
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Mark W said:
When you say late model Aisan, what years are we talking?
I have a '78...
bjowett
Supporting Vendor
Have you considered any cylinder head porting?
Mark W
Yep, I really don't really care that much I guess.
Degnol said:
I have not had a problem fitting it to any header. I always am prepared to have to shave and fit the ears of a manifold and a header to make sure they work together. Yiu don't always have to, but you always have to be readu to. No big deal. I have not had any more trouble with this intake than with any other.
Mark...
