need some advice on cam selection

Ignorant Ignis

try to decide between the monster sport cams and the greddy cams

greddy
http://translate.google.com/translate?hl=en&ie=UTF8&langpair=ja|en&u=http://www.trust-power.com/event/swispo_web/power_up_system.html

monster
http://translate.google.com/translate?hl=en&ie=UTF8&langpair=ja|en&u=http://www.monster-shop.jp/camcamshaftforswiftsportzc31s-p-2264.html%3Flanguage%3Dja

Working angle max lift
monster in 256 ext 256 int/ext 8.5mm
greddy in 248 ext 248 int/ext 9.0mm
stock in 240 ext 240 int/ext 8.3/7.8mm

i would be running an aftermarket ecu and would reset the revlimit to around 7800 - 8000rpm combined with reinforced valve springs

monster sport claims the combo can safely be run to 8200 - 8600rpm with the stock crank and rods.

included in this build would be a set of 45mm ITB long runner set up with air horns.

current injectors are 200cc
current compression ratio is at 11:1

lets hear it from the guru's of N/A

Dave · Posted: Thu Nov 05, 2009 10:57 am Post subject:

unless you are getting feedback from someone who did exactly what u did, u r fishing at the end of the day

i think your idle quality and vacuum loss would be key here and obviously with the monster these 2 would be more compromised than the greddy solution

Ignorant Ignis · Posted: Thu Nov 05, 2009 11:01 am Post subject:

dave ......please explain why the monster would be compromised.

i am a noob on this topic...... why would more lift and duration be better for vacum and idle.

reiXmann · Posted: Thu Nov 05, 2009 3:25 pm Post subject:

i think you might have to increase your compression to fully benefit

haydn28 · Posted: Thu Nov 05, 2009 3:57 pm Post subject:

if u are looking to rev to 8k with a good midrange/top end power band id choose the monster , as it has the better duration ,...

also the greddy should be more lumpy than the monster on idle and low revs.... u'll have to run the lower revs and idle richer . poorer economy.

invest in a standalone management while ur at it go for more power one time. .

because u are "upgrading" the VE and way ur engines breathes u now have the chance to optimize this with a management.

Ignorant Ignis · Posted: Thu Nov 05, 2009 4:33 pm Post subject:

jnqaz · Posted: Thu Nov 05, 2009 9:18 pm Post subject:

dont know much about your engine..
but if you plan on revving that high I'd also put in some arp head studs for safety while you at it. Having the head lift on you would suck Laughing

Swifted · Posted: Thu Nov 05, 2009 10:42 pm Post subject:

^^good advice, I've got ARPs fitted Wink

go for the Monster Spec. cams, 256 isn't a very wild cam. especially seeing that it's only 16 degrees more than the stock specs. and if your current injectors are 200cc then you wouldn't 'safely' be able to get more than about 140ish HP @ 80% dc. you're gonna need bigger injectors, at the very least 280cc (200HP).

turbohead · Posted: Thu Nov 05, 2009 11:45 pm Post subject:

duration cams tend to be better at high rpm rather than idle. vacuum would suffer because of teh longer duration an overlap might tend to be wider of you want to get power up on top so you would be have the engine breathe more than it needs to at idle. i might be worng am not a wiz but dats how i would look at it

Swifted · Posted: Fri Nov 06, 2009 10:47 am Post subject:

^^you're not far off turbohead.

With the VE of modern 4-valve/cylinder engines, they are quite happy & tractable with longer duration cams. the stock cams in the G13B engine are somewhere around 265 @ 0,06" lash. and that's a 1300cc engine! far less an engine of 1900cc capacity. With proper fuel management, in most cases where longer duration cams are fitted you won't even notice much of a lump in the idle. but with long duration cams (with overlap), higher compression is needed to scavenge the pumping losses. take this video for example;

This 1800cc 2ZZGE engine has 280/280 duration, .415/.396 Lift Crower Stage 3 cams fitted.

more specificly; Power FC, Piper Stage 3, PPE header, PPE 3' intake,Custom pipe exhaust 2 1/2, MWR valves, MWR springs, MWR TI retainers and in my opinion the best mod. custom JE Pistons 13:1 made by Red. The car is at 207 hp at the moment (JDM's are 180 Crank HP, US specs. are lower, so 207WHP is impressive!).

...listen to the quality of the idle after the runs in this video;

The beauty of Hi compression & long duration cams!! Throttle response FTW!!

Ignorant Ignis · Posted: Fri Nov 06, 2009 1:43 pm Post subject:

^^i was trying to call you yesterday

Swifted · Posted: Fri Nov 06, 2009 2:13 pm Post subject:

it was you then, lol ...i was under a car as usual Embarassed