400ex cam power gain

[400ex=awesome]

how much power does a stage 2 hotcam add in power and speed?

[gtt416ex]

it won't give you a higher top speed unless you re-gear it. but you'll gain a noticeable amount of power. are you doing any other motor mods?

[400ex=awesome]

i might put in a cdi rev box, 36 tooth rear sprocket and other stuff

[honda400ex2003]

it depends on what is done to it. if it goes with a high comp piston or something it is great if not it can actually hurt performance. stage 2s open your valves longer which lowers your dynamic compression i am not sure what it actually goes to but if it is on a stock machine it can actaully hurt power since the valves are open too long. if it is stock then a stage 1 may be a bit better since it is not as radical and will let it breath better without hurting it. People have different opinions on it though. I have not had any actual experience with running one on a stock machine but in my opinion it will lose too much compression to make it any better. I think TRXracer1 has done the calcs to see what it actually is for static and dynamic compressions for these cams but i am not sure on that either. you could do some searching around if you like. steve

[honda400ex2003]

http://www.exriders.com/vbb/showthread.php?s=&threadid=392231&highlight=dynamic+compression

heres some good info on it. steve

[honda300EXtreme]

Originally posted by honda400ex2003
it depends on what is done to it. if it goes with a high comp piston or something it is great if not it can actually hurt performance. stage 2s open your valves longer which lowers your dynamic compression i am not sure what it actually goes to but if it is on a stock machine it can actaully hurt power since the valves are open too long. if it is stock then a stage 1 may be a bit better since it is not as radical and will let it breath better without hurting it. People have different opinions on it though. I have not had any actual experience with running one on a stock machine but in my opinion it will lose too much compression to make it any better. I think TRXracer1 has done the calcs to see what it actually is for static and dynamic compressions for these cams but i am not sure on that either. you could do some searching around if you like. steve

glad you brought up cam duaration and higher compression. alot of people forget about this. well said

[honda400ex2003]

thank you very much. i like to let people know since it doesnt always make more power by adding a higher stage like people hope to believe. lol. steve

[tri5ron]

Originally posted by 400ex=awesome
i might put in a cdi rev box, 36 tooth rear sprocket and other stuff add a pair of spider grips, some cool graphics, and a spal fan to the airbox lid, and you'll be all set.

[honda400ex2003]

bam, he just kicked the hundy up a notch. it is truely good to have you back. :) steve

[bkelley]

Originally posted by tri5ron
add a pair of spider grips, some cool graphics, and a spal fan to the airbox lid, and you'll be all set. Don't give out the secret mods so quick!

[johnnynonails]

dam, thats why im not fast...........ive got pro grip,grips...(joke);)

[honda400ex2003]

you guys need to get scott hurricanes like mine. they make you fast as a hurricane. heck with the rest. steve

[honda400ex2003]

i am wondering if anyone has done the calcs for static and dymanic ratios for
11:1 stage 1, 2 and 3
10:1 stage 1, 2 and 3
and 12:1 stage 1, 2, and 3

i only found a few that GPRacer2500 did but it was only one or two but it was still some good info.
Stock cam cranking compression at 1000ft = 8.2:1
HC stage 1 cranking compression at 1000ft = 7.8:1
HC stage 2 cranking compression at 1000ft = 7.6:1

If you go to a 11.0:1 piston (instead of the stock 9.1:1 piston) then the numbers change to:

stock cam: 9.9:1
HC stg 1: 9.5:1
HC stg 2: 9.2:1

I think that it would be an interesting idea to find out all of them together and do a comparison of where the best compression ratio is for a full clean burn and squench area of the piston. I know that some guys do some modding to the head to help to achieve the best area possible but i bet with the right combo of gaskets, compression, gas, and cam profile it would be best. If anyone has any ideas let me know. steve

[81 clark racing]

i run a STAGE 2 hotcam with stock comp and have had no issue.she rips alot better then with the stock cam

[Duf6]

so if 11-1 goes down to 9.2-1 with a stg 2 could you run a 12-1 with stg 2 on 93 pump gas since it drops so much with a bigger cam? I have stock compression too with a stg 2 and its faster than it was but I do need more compression