Hello all,
I am considering purchasing a 99 H22A4 head consisting of all Ferrea components. It has been ported and polished with a multiangle valve job and 1mm oversized valves. I am currently building a mostly street, some autocross, JDM H22a closed deck engine that consists of oversized Type S pistons, all ARP hardware, has a LoveFab header, and TWM Individual Throttle Bodies. I have a Fast ECU w/ Wideband to control it all. I also plan to purchase Crower Stage 2 cams. Basically what I want to know is will I ever use the full potential of the head or will I just lose lots of low end torque because my engine wouldn't be able to pump enough air to make all the porting and oversized valves useful. Thanks in advance.
Dan

 

Someone has to have at least an opinion?
Dan

 

I'm not an expert yet, but I'd say you'll benefit. Anything you can do to open up your head will help those ITB's reach their full potential.

If you do get that head remember that oversize valves do not work with your more extreme cam profiles.

 

My guess would be that it will have little low end power with that setup. Big ports, aggressive cams, ITB's and no forced induction always present that problem... You will have crazy *** top end though...

 

im running 1mm oversized manley valves with no problems i just cant run diff. cams because of clearance issues

 

Thanks for the help. So would there be clearence issues with the Crower Stage 2 then?
Dan

 

If there were clearance issues with the Crower stage 2 cams, you would need to split the cams to generate the necessary clearance. This would result in advance exhaust and retarded intake timing. I'm not sure how well that would work, though.

It may be time well spent to talk to Crower. Their stage 1 cams may not cause interference issues. If this is the case, I would reccomend asking them about a custom set with the modified non-vtec lobes of the stage 2 cams, and the vtec lobes of the stage 1 cams.

 

I have heard of clearances issues with bigger cams on oversized valves before. IIRC, Type-S cams have even had problems w/ them!

Just IMHO, don't bother with the O/S valves. Get some good portwork, big cams, up the compression, and let the stock valve-size work. The stock valve-size is not that bad at all.

 

I have oversized valves and cams with well over .500+ (12.7mm+) lift on both the intake and exhaust cam with no clearance issues at all. It takes some work to set everything up to maintain .030 clearance, but, you can in fact make them clear comfortably.

This is a full drag motor BTW

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Innovation &raquo;</TD></TR><TR><TD CLASS="quote">I have oversized valves and cams with well over .500+ (12.7mm+) lift on both the intake and exhaust cam with no clearance issues at all. It takes some work to set everything up to maintain .030 clearance, but, you can in fact make them clear comfortably.
</TD></TR></TABLE>

I guess it can be done. Though I'm wondering if the drag motor is NA or Boosted, since a boosted set up will have slightly less clearance issues.

Regardless, if one is considering oversized valves then cam profiles, adjustment, and timing must all be handled intelligently. If you go oversized with big cams, definitely plan of claying the motor to make sure it is all working properly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2lude4u &raquo;</TD></TR><TR><TD CLASS="quote">

I guess it can be done. Though I'm wondering if the drag motor is NA or Boosted, since a boosted set up will have slightly less clearance issues</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Innovation &raquo;</TD></TR><TR><TD CLASS="quote">cams with well over .500+ (12.7mm+) lift</TD></TR></TABLE>

NA

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rawkus &raquo;</TD></TR><TR><TD CLASS="quote">Hello all,
I am considering purchasing a 99 H22A4 head consisting of all Ferrea components. It has been ported and polished with a multiangle valve job and 1mm oversized valves. I am currently building a mostly street, some autocross, JDM H22a closed deck engine that consists of oversized Type S pistons, all ARP hardware, has a LoveFab header, and TWM Individual Throttle Bodies. I have a Fast ECU w/ Wideband to control it all. I also plan to purchase Crower Stage 2 cams. Basically what I want to know is will I ever use the full potential of the head or will I just lose lots of low end torque because my engine wouldn't be able to pump enough air to make all the porting and oversized valves useful. Thanks in advance.
Dan</TD></TR></TABLE>
Personally i believe you will make good numbers because i believe with over sized valves it will still only put at about 11:5 overall compression which is def. Streetable. And you will be making enough air with that compression and stage 2 cams i think you def. are in for alot of fun with this project. This is for you bro.

But just to make sure when you install the cams that you have no issues caly the motor. I cant stress that enough with oversized valves.

Also only downside with aftermarket valves is they just dont bend like OEM. They brake and casue damage in the head if somehting goes bad. Just wanted to add that tidbit. lol Nonetheless good times bro,

 

Thanks for all the info guys. I will keep you up to date with the build.
Dan