fdjizm

hey guys my search came up empty on cam timing, and such, i just bought an aem cam gear for my d16, what is the general rule or thumb, advance-more bottom end right? and retard more top end at the cost of bottom?.. i have a 105300 comp cam, would advancing it help or retard it?

doood

iTrader: (1)

put it on a dyno to see if either hurts or helps

platinumx6

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by that one doood &raquo;</TD></TR><TR><TD CLASS="quote">put it on a dyno to see if either hurts or helps</TD></TR></TABLE>

i wish i had your money

doood

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by platinumx6 &raquo;</TD></TR><TR><TD CLASS="quote">

i wish i had your money</TD></TR></TABLE>

you want my $.3?

schardbody

run it straight up. unless you have head modifications that require you to retard it some to make power higher then there is no reason. slowly advance it until it feels like it pulls good to redline, then leave it alone.

DONT FORGET, changing cam timing changes ignition timing, so for every change of the cam timing you MUST adjust ignition timing, or face the chance of detonation.

platinumx6

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by that one doood &raquo;</TD></TR><TR><TD CLASS="quote">

you want my $.3?</TD></TR></TABLE>

lol i was reffering to the money you use for a dyno tune.

fdjizm

well i dont have 200 bucks to throw on a dyno right now after spending 200 for the cam, im just trying to find a good rule of thumb for cam timing, im keeping stock redline so if i advance like 2* would it hurt power? im looking to get more bottem end, since now with this cam i have more mid and top, but bottom end is crap.. and i have to adjust the dizzy to? so if i advance the ca gear 2* lets say, i would have to retard the dizzy 2* is that what u mean? i cant just leave the diz alone and mess with the cam gear only

schardbody

well, seeing as how the dizzy bolts to the camshaft, changing cam timing changes ignition timing as well.

and yes, advancing the cam timing x amount retards the ignition timing x amount. and vise versa.

B18C5-EH2

There is NO "general rule" when it comes to advancing/retarding cam timing to make power on any single engine.

Example?

I've got a B18C5 and my cam settings peaked power at +2, -2 on my cam gears, but my friend's B18C5 made his peak numbers at +4, -1 on his cam gears.

You really NEED dyno tuning to make sure you're getting the most power - period.

schardbody

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">There is NO "general rule" when it comes to advancing/retarding cam timing to make power on any single engine.

Example?

I've got a B18C5 and my cam settings peaked power at +2, -2 on my cam gears, but my friend's B18C5 made his peak numbers at +4, -1 on his cam gears.

You really NEED dyno tuning to make sure you're getting the most power - period.</TD></TR></TABLE>

YEP, but just to add, on a single cam, the power isnt really afffected, more so the powerband.

fdjizm

ok well then yea i guess i have to get to a dyno, just feels weird putting a new cam gear in and leaving it on zero im going to mess with it over the weekend, never more than 3 degrees each way and see how the engine feels, untill i get it to a dyno, from what i been reading there is a general rule and it is.. advance=bottom end retard=top end thats all i was looking for, to know what changes to look for when i mess with the cam gear.. i wouldnt mind losing some top for some bottom end, seeing as im keeping the stock redline, with this 105300 cam

schardbody

so you did a cam swap to gain bottom end power???

platinum00

If you have the 105300 cam, your running a SOHC motor. You’re not going to gain anything from a cam gear. You might be able to move the powerband around a little but you’re not going to gain peak power.

The came will increase your powerband without adjusting the cam gear.

Hope you replaced your valve springs and retainers with that cam, if not you might be better suited for the 105100 which is less agressive.

Also make sure you check your iginition timing after setting the cam. it's been know to throw you timing way off to the point where you might need to notch the dizzy to get it back to *16

platinum.

fdjizm

yea i didnt check my ignition timing that could possibly be a problem also, and i installed the cam to gain more power over all, but i didnt know i was going to lose so much low end power.. i mean NO acceleration till 3500rpm. cant even squeal anymore, i figure i move the power band lower since im keeping stock redline anyway and maybe advance the cam gear like 3* to get some low end back and see how it runs..