Originally Posted by reddroptop
(Post 208171)
Exactly, just because nobody (almost) in the Miata world does it, doesn't mean they do not work.
I am curious to see what would happen though. |
thought while i was in there doing a timing belt its not to much more work to replace the cams and gears.
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Originally Posted by blueovalmiata
(Post 209872)
thought while i was in there doing a timing belt its not to much more work to replace the cams and gears.
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ok but what lift duration is reccomended for turbo?
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Originally Posted by The_Pipefather
(Post 208401)
Maybe for an NA engine. Atleast in theory, boost can compensate for those 20 degrees of overlap you have on a stock 1.6. Since we have DOHC we should be taking advantage of the ability to vary intake and exhaust independently. I dont know why many people haven't done that yet since cost-wise pulleys dont cost that much. A good place to start would be retarding the exhaust cam IMO. Of course the goal would be to pick up hp in the lower rpm range.
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you may also need solid lifters, are they a requirement or suggestion?
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Originally Posted by reddroptop
(Post 208171)
Exactly, just because nobody (almost) in the Miata world does it, doesn't mean they do not work.
"MAN FUCK YOU GUYS JUST CAUSE NOBODY'S DONE IT DOESNT MEAN IT ISNT A GOOD IDEA" 750,000 Miata owners, lots of smart guys tweaking on them for the past 18 years. If there's a mod that is cheap and easy and nets a lot of power, it's fucking been done. There is not some holy grail camshaft that adds 25whp on a 160whp motor that "NOBODY'S FOUND YET CAUSE NOBODY HAS TRIED". Fuck you, of course people have tried, and they've found that unless you are going to a really big setup or revving the motor way harder than stock (1000rpm+), it's not worth it. As far as I'm concerned, unless you are willing to spend a lot of money and a lot of time to get a small horsepower gain, "because nobody else has done it" is a perfectly valid reason to leave well enough alone. |
plenty of people have gone with webcam 505 sticks with adjustable gears. it was all the rave a few years back on turbo cars. it just seems that these newer turbo kits make the same amount of power as the last generation turbo kits + cams, so fewer people are looking for cams.
also, the webcams have gone from $350 to $550 recently. |
Certainly a set of back-to-back dyno runs would be pretty awesome. That OEM cams are ideal is a long shot, how close they are, who knows.
If I had to guess, I would say that there's a huge resistance for people giving up the "non-interferance" honor. People with fast cars admit that a broken belt is a broken motor, but miata people are scared. I've never heard a good reason not to get cams aside from that. Since I'm on my third belt in 70,000 miles (I change it "while I'm in there"), I personally think it would be fine to get some more lift - ever look at the flow numbers? That last bit of lift is huge for flow. |
Originally Posted by Ben
(Post 208170)
I smell bullshit and am willing to prove it.
Dyno proof forthcoming... I'm really looking forward to your results either way. |
Originally Posted by neogenesis2004
(Post 210592)
Tell this to all the 4g63 guys running 280deg crower cams and 25+ psi.....
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I am using the HKS stII 264's with stock cam gears at my turbo setup.
I 've lost a 200 rpm spool but I saw very big differences at high's. |
what are the lift and duration numbers for those cams?
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Originally Posted by MX5-4me
(Post 210906)
If those are what i think they are then the folks at www.mazda-speed.com will tell you that are the same as 99-00 cams and aren't worth your time and money.. even though that have no real proof...haha.. Have those things spec'd before you put them in !!!
I'm really looking forward to your results either way. I'm going to ask Randy Stocker to measure the MSM intake cam and post it on his site. |
Originally Posted by Ben
(Post 210920)
I'm going to ask Randy Stocker to measure the MSM intake cam and post it on his site.
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btw, I went and found your link to your thread... I have NO IDEA where your boy is getting his part numbers from... but they're wrong.
Upon visual comparison, the 99-00 cams are both stamped BP 4W and the MSM intake cam is clearly stamped 5A. I've looked at many sets over the past few weeks... if you want, I can snap some photos so you can shove it up his ass |
Originally Posted by Ben
(Post 210929)
btw, I went and found your link to your thread... I have NO IDEA where your boy is getting his part numbers from... but they're wrong.
Upon visual comparison, the 99-00 cams are both stamped BP 4W and the MSM intake cam is clearly stamped B5. I've looked at many sets over the past few weeks... if you want, I can snap some photos so you can shove it up his ass I'll PM you my E-Mail .. |
Here's the best I can do in a pinch...
Hi, I'm a BP-4W out of a 1999 miata. Note my ugly ass exhaust manifoldhttp://img517.imageshack.us/img517/2424/pict0476go2.jpg Here is a close up of my camshafts. Note that the exhaust cam is the closer, and the intake cam is further away. Also note the intake cam is embossed with "BP" with "4W" over it. http://img230.imageshack.us/img230/6155/pict0477jj2.jpg Here it is as viewed from the intake side. Note 4W is embossed prominently (it's upside down) http://img406.imageshack.us/img406/6840/pict0481pe4.jpg And finally, here is a poor MSM cylinder head with "5A" embossed on the intake cam http://img516.imageshack.us/img516/6382/pict0479qd7.jpg But hey, they're the same camshaft right :fm: |
Anybody actually have cams in w/ before and after #s?
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Originally Posted by The_Pipefather
(Post 210918)
what are the lift and duration numbers for those cams?
Duration => 264 Lift => 9.3 mm intake Duration => 264 Lift => 9.5 mm |
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