I have almost every aspect of my motor figured out, except for which cam combination to run. So far, the build is as follows:

B18C GE Sleeved @ 85mm
ITR head *no portwork*
1mm oversized intake valves
CP 12:1
Manley Rods
50mm ITB's
Comptech Race header
T1R 2.5" catback, no bottlenecks
Uberdata

That is the basics. This is going into my ITR for a mix of street and track duty. Not into the drag thing, so peak power is not as important. Im mainly interested in power between 5000 and 9000 rpms, which is where the motor will spend most of its life on the track. I do not want to revv much past 9000, mainly for reliability purposes, so peak power needs to come in before 9000.

Toda B's or C's? From what I've seen they have one of the largest non-VTEC lobes, so the ITB's can sufficiently feed them the air they need.

I sold a set of JUN 3's this year, maybe go back to them? They have longer overlap than the TODA's, so power after ~7k will be better. Very consistant cam, and easy to tune.

I do not know much about Rocket cams. I have heard that the M24 size works well with 85mm and 12:1...but again, my knowledge lacks with these.

Skunk2 cams, never personally delt with them, but hear great things about the stage 2's and 3's...but maybe a little to peaky for my application, no?

Buddy club. They are a very mild cam from the spec sheets I've read, but that may work to my advantage if my target powerband is between 5k and 9k. Would probably be the IV's if I went with BC.

I would like personal expereince rather than heresay, if that can be at all possible.

Thanks in advance, and for reading my essay


Modified by 92TypeR at 11:59 AM 11/16/2004

 

All that goodstuff and your not doing any head work?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CompressionFed &raquo;</TD></TR><TR><TD CLASS="quote">All that goodstuff and your not doing any head work? </TD></TR></TABLE>

Portwork, although does affect the whole powerband, has more of a dramatic affect on the topend, which is less of a concern to me. I would rather spend the money from portwork on suspension and chassis tuning, where I can see more of a realistic affect on laptimes

 

bump for more info and opinions. my setup is almost identical, so im curious as well

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">Portwork, although does affect the whole powerband, has more of a dramatic affect on the topend, which is less of a concern to me. I would rather spend the money from portwork on suspension and chassis tuning, where I can see more of a realistic affect on laptimes </TD></TR></TABLE>

a good valve job is ALWAYS a good addition to an engine..the actual port work itself isn't a necessity though..

but you'll need some big cams, call up brad at RLZ...and he spec you out a nice RR cam

 

A simple cleaning of the bowls is going to be part of the machining process for when the 1mm oversized valves go in. Nothing spectacular or ground breaking, mainly just getting rid of the casting imperfections.

I dont know if a big cam is that necessary, as most big cams, IE Skunk 3's, and Toda C's, make their power closer, and sometimes higher than 9000 rpms, which is, give or take my limit as previously mentioned. I know the primary lobes will have to be sufficiently large, but the VTEC lobe I *think* has to have a more mild duration, but a strong lift to supply the power, while keeping peak a little lower in the revvs.

 

toda's non vtec lobe with your combonation will probably make power to 7500 rpm

 

I would use s2s2 cams for 12/1cr.

 

I would recomend Rocket M22's. You could also give RLZ Stage 2's a shot, but it is hard to find info on them.

 

Thanks for all the replies.

The thing is, the midrange with my current ITR cams is terrific considering...

I would like to at least equal what midrange I have, but still make more power past 7k, where the ITR (CTR's) fall short.

I do not know much about RLZ products.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dan GSR &raquo;</TD></TR><TR><TD CLASS="quote">toda's non vtec lobe with your combonation will probably make power to 7500 rpm </TD></TR></TABLE>

Thats what I was thinking. I know many Honda Challenge motors run either TODA B's or C's. I have been leaning towards TODA C's, but I have yet to make any final decision until I hear from more people about other possible cam setups. But considering the fact that the C's allow the ITB's to really shine because of the larger lift on the non-VTEC lobe, they are looking more and more like the cam of choice for my particular application.

 

i run sk2 st2's and make good smooth power from 6 to 9k without your c/r, and 12:1 is the c/r these cams love, so they may work even better for you! just my .02

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rochesterricer &raquo;</TD></TR><TR><TD CLASS="quote">I would recomend Rocket M22's. You could also give RLZ Stage 2's a shot, but it is hard to find info on them.</TD></TR></TABLE>

the smart ppl now run RLZ stage 3's


guess who!??!?!?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">
Thats what I was thinking. I know many Honda Challenge motors run either TODA B's or C's. I have been leaning towards TODA C's, but I have yet to make any final decision until I hear from more people about other possible cam setups. But considering the fact that the C's allow the ITB's to really shine because of the larger lift on the non-VTEC lobe, they are looking more and more like the cam of choice for my particular application.</TD></TR></TABLE>

Much the same thoughts i had about cams for my engine build, and when a good deal on a set of Toda C cams and gears came along i went for it. I know there are cams out there with a higher peak power than the Toda's but i will limit myself to around 9k redline as i will be using the car for daily driving and HPDE/trackdays, so some degree of reliability is wanted. What i am looking for is good power from 4k to redline, hopefully this will work out.

 

have you considered buddy club spec 3 pluses? There are a couple of threads going that show some nice midrange power. Just a thought.

 

&lt;--- also has some Toda C's waiting to go in
Road race

only place where little 4 banger with little to no mods can pass the big v8

 

That's very similar to my setup, 12:1 CR and 85mm as well and I'm using toda c's. They make power from 6000 to 9300. As for your ITB's [which i wish i had] yes, it will feed them the right amount of air which will be excellent for your street/track setup.

 

Todas C's it is

After talking in person with a couple H0 Honda Challenge drivers, the census is that b18's running C's usually have the best midrange when fed using ITB's. The large non-VTEC lobe helps with this a bunch. Tuning using uberdata will be a biatch because vacumn at idle will be such a change from stock IM/cams.

 

You will have a stronger and wider powerband with Toda B's or even Skunk2 Stage 2's. The C's will have good midrange like you said, but only in the proper engine package. 12:1 compression isn't much for those cams. Compression has more of an affect then iduction (itb's). With too wild of a cam for the compression ratio, you will have air bleeding back through the intake valves which results in a drop in cranking pressure.

 

try my JUN 4's

 

toda B's and C's use the same non-vtec lobes

 

Jun 4's if you want more torque for road racing, for drag racing nothing beats the Jun 3's, BC 4's might hang, but the Jun 3's are SO hard to beat in any situation. They'll knock a Toda cam almost in any given situation.

 

i'd give the buddy club 4's a try or call up rlz

 

keep in mind the over sized intake valves will limit the cams you can use. i would not go oversized. just a good valve job.