I am curious if someone has attempted to port and polish a Ralliart head?? I am wondering what kind of gains we could expect from that?? or a ported and polished head port matched with an RRM manifold??? What do you guys think?? A possible RRM package in the future....

 

Ported and polished head+RRM manifold=$$$$$$$$$$$$$
It would/should show really good gains though.

 

I would think it'd cost WAY too much money for RRM to buy a couple heads to start out with. Then the labor to swap all the valves and whatnot over and do the install, etc.

Probably cheaper, but still expensive, to find a speedshop to do it for you. I can't see how it'd be anywhere near worth the money, though.

 

Well, Here's the thing. For it to show REALLY good gains you'd have to P+P the manifold again. The RRM one was P+P to match the stock RA head. So if you do the head then the manifold will no longer match. You'll still see gains, but not to its potential.

 

if u port and polish the head then go buy the RRM intake minifold, u obviously have no idea what ur doing. not to sound harsh or anything, but there are still alot of unknowns. the RRM manifold is a STOCK manifold that is just ported to match. that is, the runs are no longer and it is optimized in no way at all other than the end that feeds the engine is made a bit wider, or 'matched'. matched to what, u say? we dunno yet. maybe its matched to the stock head porting and then polished up a bit. actually, its probably ported to match the intake gasket....not the head itself (duh). its also powdercoated to make all of u who only care about what your make ur eyes happy want to drop $500 on some extra engine bling.

there are 2 things that may happen if you want to port the head and that depends on the relation of the stock head porting and intake gasket. if the stock head porting is smaller than the gasket, then portmatching it to the gasket (which is also most likely what he RRM pre-polished intake mani is ported to) will be optimal.

if the stock head porting is already LARGER than the intake gasket (this is very rarely the case, but it happens sometimes), then the gasket itself needs to be modified, and so would any manifold you happen to buy or create.

in the end, if you make the head porting larger, the pre-ported RRM manifold needs to be ported even more, then repolished, unless you match it to match the gasket given RRM has done the same. but if you are doing all this to ur head ur self, why not just port the intake manifold urself while ur at it? even if u have a shop do one, they will surely do the other for less than the cost of the RRM manifold, which is the exact same stock manifold that you have already.

as for gains, im pretty sure YMMV depending on what else you have done.
i suggest shopping around for a local machine shop and pricing out a 4cyl head and intake mani port match and polish to a stock gasket.

 

Hehe....you just read mine and expanded on it didn't you! :-p

Either way. Its true.

 

good doc for u all too, if u wana try this urself =)

http://www.sa-motorsports.com/diyport.shtm

also, dont forget about the exhaust side. if you port/polish the intake mani and head, u might also wana think about doing the same /w the exhaust gaskets. however, underporting on the exhaust can have positive effects to torque

 

So realy what everyone is saying is to save your money, goto a local shop and have the P+P your the whole thing insted of buying a rrm IM and then having to spend more moeny on getting it reported

 

Well, thats not what I'm saying. For anyone who wants to p+p the head as well then yes. get it done local. BUT, no one really knows if its needed yet.

Now, we don't know how much it would cost to do a p+p local. Also, its not practicle for everyone to be w/o they're car for a day or so for the job to be done. For most of us its our daily driver. Which is why bolt on's work well. As for the whole "engine bling" thing...well, some people like it. No fault in that.

So, I guess what i'm getting at is this...Do whatever makes sense to your overall goal. Don't spend more money then ya need too. If your ONLY doing bolt on's and can't be w/o your car - buy the RRM one. If you think your gonna p+p your head and mani then get it done local and let us know how it goes.

 

Just throwing out ideas to give the natural aspired guys the upper hand. There isnt really that much out there for these cars. The aftermarket hasnt really embrassed this car like it should have. Its a little over a year since this new platform has been out and the biggest supporter, right now, is RRM. Anyway this was an idea that I had come up with and I am sure others have thought about it. I figure if someone with a D16 single cam Vtec honda motor can port and polish, and see decent gains. There is a possiblity that the same kind of gains could be had with our Mivec motors. Just a thought!!

 

i think some one here said that 4g69 head didn't need to be p+p.

 

dont forget that the gains achieved by a port/polish are only as good as the poor manufacturing of the stock head and manifolds nothing against honda, but i dont think the d16 was as refined as the 4g69. I def think there are good gains to be had, but not greater than a 10% increase in power. also, i wouldnt consider this unless you are a semi-serious racer. that said, whos first?

 

me and you jason. vrs we go!!! or billet... damn. let me know.

 

for billet's price, may as well buy the RRM one and slap a cat on it. i already tried that =) ill email migel today and see what he thinks

 

Cylinder head would require professional install. We are steering away from it right now. Kinda like pistons. Guys found out after they purchased it that install costs as much as the part if not more. Kinda does not make sense for the customer to do it.

ROAD/RACE