whitemiata

ok my car is originally a auto car (now 5spd) but i still have the auto engine in it which i thought was mostly the same but i was just reading on solomiata that the auto cams are different!
http://www.solomiata.com/cams.html
now i still have the motor from the 5 spd swap and im wondering if it would be worth it if i swapped the cams over or is it not much of a difference? im not educated much on lift and duration etc so please give me some pointers. Thanks!

chicksdigmiatas

iTrader: (11)

Seems like a lot of work, and those cam cap bolts break on me half the time. But i dont know the answer, and your probably not missing that much power.

Savington

iTrader: (31)

If you know what you're doing it's a 2 hour job. You need an in.lbs torque wrench for the cam caps - the torque is like 105in.lbs or something equally low. It's free power, no reason to not do it.

G2B

Keep the 5spd intake cam and swap in the auto exhaust cam. The higher lift on the 5spd intake is better suited for force feeding (BOOST!), and the -10deg. of overlap gained from using the auto exhaust cam will insure that more of your intake charge is burnt in the cyl rather than your exhaust.

Braineack

iTrader: (62)

I had a friend that had an auto motor with his greddy kit bolted on...spooled better than any other I've seen.

yunvmyegt

iTrader: (3)

off topic, but when did solomiata's site come back? or did they copy the info from the original site that posted it years ago? i forget its been so long....

Braineack

iTrader: (62)

Flyin' Miata rehosted it.

Sparetire

So swap in the manual intake cam and keep the auto ex cam right?

levnubhin

iTrader: (30)

Yes
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ThePass

iTrader: (3)

For those of us with the more common manual 1.6, is there a documented benefit to using the exhaust cam off an auto 1.6?
Very interested...
-Ryan

Braineack

iTrader: (62)

It's always been said that the auto cams take to boost better, but not a lot of people have done it nor documented it.

Thucydides

Like G2B pointed out, you want LESS overlap for a boosted engine. I think he's got the correct formula.

mtm68

anyone have any idea on quantifiable gains doing this?

magnamx-5

iTrader: (7)

it all depends on how your system is setup man. Yes the theoreticall gains are easily quantified but we must adress the meriad of variables in doing so or the results will end up hopelessly skewed and meaningless.