Intake Cam for 99?

[varmint]

Can someone advise on which stock intake Cam we have on Australian 1999 models?

I see a lot of talk on American forums re the BP5A-12-420 as an upgrade, but I suspect we have that as stock here.

Any help appreciated.

[sailaholic]

Are they talking about the exhintake cam? It was apparently a semi common swap to get another exhaust cam, do some light machining ( cut the end off) and put it on the intake side?

[varmint]

No - not the exhintake. I think that's a mod for NA models only?

Details are here-

http://949racing.com/mazdaspeed-miata-intake-cam.aspx

if it is an upgrade for AUS 99-00 then its a lot cheaper than alternative cam upgrades

in US the Stock Cam for a 99 is a BP4w, so when they drop in the BP5A it has the same duration but higher lift = more HP

another link to discussion where it is shown that a UK car has the BP5A-

http://forum.miata.net/vb/showthread.ph ... cam&page=7

So is there anyone who has the cover off their 98-00 model at the moment?

[project.r.racing]

I would trust what Edwin 'TheMan' posted. As he said, only North America had the BP4W intake cam. And I think the specs for the duration are incorrect on the 949 racing site. Much longer than the really are.

The only oem BP 96-00 solid lifter spec cams I'm aware of are:-

231-8.99/241-8.89 - BP2Y on them, 96-98 BP from 323s/Lasers
237-8.28/242-8.89 - BP4W/BP5A not 100% sure, but guessing USDM spec non turbo
241-8.79/242-8.89 - BP5A USDM turbo miata, also guessing AUDM non turbo spec

[varmint]

Yes I saw "theMAN"s posts, but if you go through the thread he can only confirm European, and has a strong opinion about JDM, having the BP5A cams. He was assuming the Aus version has them.

I can't make that assumption. Our specs for the 98-00 don't seem to be the same as JDM or euro. They have square top intake manifold don't they, whereas we have VICS? JDM does not have EGR. One of the reasons the US have BP4W is supposed to be emissions. Perhaps they had to do that for Aus but didn't need to in US and EU?

I'm sorry, I thought this may have been discussed before but nothing come up in search.

Here is a dyno of the difference between the two cams.

http://mazdaroadster.net/showthread.php ... no-Results

so if it is an upgrade, just over $200, I'll have it.

But if someone can recommend an aftermarket cam that is a mild upgrade, practical for street but give 4-5 KW bump then I would appreciate the advice. Or perhaps the sort of specs I should be looking for.

[project.r.racing]

Edwin doesn't assume. He collects the parts catalogs from various markets, so he normally has concrete proof before the starts typing. I cannot say with 100% surity that he is correct on this occassion, but he is rarely incorrect.

Maybe you could call MX5Plus and ask them. They have openned 100s of these engines.

As for mild cams to put in, ask Wozzah (forum user), Maruha, Toda, Poncam etc all sell cams. most will have between 252 and 256 duration and around 9mm of lift. Some will require new lifters, some will work with the oem lifters.

I've gone through a few cams in the past few years. Had the Maruha 252/9.2 256/95 spec F-cams ready to go in, then found out I didn't have HLAs, had solid OEM lifters. Sold them and brought Toda billet oem base circle cams in 256/9.0 in/ex specs. Didn't know it at the time, but as I said earlier, 323s/Lasers in the BP05 engine went from HLAs to solids in 96.

[varmint]

Thanks Bud. Yes Ive been looking at some of that stuff. Maruha and Tomei, especially, their "street" options, but big bucks.

[wozzah1975]

Thanks Bud. Yes Ive been looking at some of that stuff. Maruha and Tomei, especially, their "street" options, but big bucks.

I have regrinds available for $460 pair (or $230 for 1), anything up to about 270deg (smaller available). Direct fit, may require some ECU tweaks on a 99 but shouldn't be any problem for someone in the game to tune it.

Cheers
Woz

[wozzah1975]

And also new billets in any size for $930 pair plus postage

Cheers
Woz