i hesitated to post this cause im sure its been covered before but the search has been down for 2 days and i couldnt wait for it any more.

anyway whats the rule on catch cans for honda challenge? the rules make no mention of it at all. some people say that for road racing in general it has to be 1 qt capacity, but again he HC rule book makes no mention of it. so whats the rule on catch cans for honda challenge? are they allowed and is there a capacity requirement?

 

I dont thnk its a requirement for HC, but for SCCA you are supposed to have a 1qt catch can. They're certainly allowed in HC - I'll be tossing my charcoal canister over the winter to put a catch can in its place.

 

so their allowed but no capacity requirements? i want to run the endyn can, thats why im asking, almost no catchcans are 1 qt.

 

bump

 

well search is back up, and i think im gonna go with the endyn one. im gonna draw up a quick diagram to make sure im correct in how it works...

 

this is what i think of when i look at the parts, is this the correct setup for the endyn catch can?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRCRXsi &raquo;</TD></TR><TR><TD CLASS="quote">i hesitated to post this cause im sure its been covered before but the search has been down for 2 days and i couldnt wait for it any more.

anyway whats the rule on catch cans for honda challenge? the rules make no mention of it at all. some people say that for road racing in general it has to be 1 qt capacity, but again he HC rule book makes no mention of it. so whats the rule on catch cans for honda challenge? are they allowed and is there a capacity requirement?</TD></TR></TABLE>

you have to read the nasa CCR and it states you have to have a min capacity of 1 qt. there are tons of them out there cheap too!

 

There are several 1 quart catch cans available in addition to the Endyn. Take a look at Summit's online catalog. Most of the cans will hae a drain valve on the bottom so that you do not return anything to the engine.

 

why wouldnt you want to return it to the engine? that makes no sense. id want to keep every bit of oil in there that i could. also no need to manually drain the catch can.

so the endyn one is indeed 1 qt capacity? to those running the endyn can, is my drawing correct with how its installed? and does anyone use this in addition to the breather box? or did you remove it?

 

The diagram is incorrect.

what is that port above the two similar ones on the block?

The way the Endyn can is supposed to be hooked up even in an open config is the valve cover always receives fresh air from the intake arm.

The two ports on the can go to the two similar looking ports on the block while the T-fit is Teed into the can's drain.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRCRXsi &raquo;</TD></TR><TR><TD CLASS="quote">why wouldnt you want to return it to the engine? that makes no sense. id want to keep every bit of oil in there that i could. also no need to manually drain the catch can. </TD></TR></TABLE>

You should not get that much in the catch can to make it a big deal. The main goal it to catch the vapors that would normanly go into the intake.

BTW after draining my catch can, I would not what came out back in the motor..

 

what about all these people claiming to fill it up after 1 sesion of racing? and i dont see how the oil that gets in the can isnt the same as the oil thats already in the motor, so why not put it back? the stock breather box thing drains back.

and why does the VC need fresh air from the intake arm? it just spits oil into the intake stream, i thought thats what we were trying to avoid?

and that port above the 2 smaller ones is the port that originally goes into the breather box. theres 2 freeze plugs underneath that that endyn uses for additional venting right? hmm i need a pic of the back of a gsr block now with the box removed, lemme see if i can find one...

heres a pic i found. i used paint to illustrate what im understanding. please correct it if need be.

looking at endyns pic of the breather canister it comes with 2 freeze plug nipples. ive pointed out where i think they go. the bottom big hole is where the stock canister drains back right?




Modified by GSRCRXsi at 2:23 PM 11/13/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRCRXsi &raquo;</TD></TR><TR><TD CLASS="quote">what about all these people claiming to fill it up after 1 sesion of racing? and i dont see how the oil that gets in the can isnt the same as the oil that's already in the motor, so why not put it back? the stock breather box thing drains back.</TD></TR></TABLE>

all these people? who are all these people? if your filling up a 1 qt catch can in a 30 min sprint race you have other problems.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRCRXsi &raquo;</TD></TR><TR><TD CLASS="quote">
and why does the VC need fresh air from the intake arm? it just spits oil into the intake stream, i thought that's what we were trying to avoid?
</TD></TR></TABLE>

the VC does not need fresh air. you are simply trying to reduce the pressure in the crankcase. For emissions reasons it is vented into the intake system.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRCRXsi &raquo;</TD></TR><TR><TD CLASS="quote">and why does the VC need fresh air from the intake arm? it just spits oil into the intake stream, i thought thats what we were trying to avoid?
</TD></TR></TABLE>

Look at your service manual - air is flowing into the VC, not out of. The oil vapor you want to catch comes from the PCV system.

 

the system is designed to flow (suck) air out of the stock breather chamber (which goes to the PCV valve and then to the IM) and during lower rpms, when theres not a lot of blowby, air is drawn INTO the valvecover to replace the air that went out the breather chamber.

during higher PRM and when blowby is higher, then air is forced out both the breather chamber AND valvecover.

rj, you should look at the service manual.

 

plenty of people in other threads concerning catch cans claim to fill it in a sesion. whether its due to mechanical issues, i cant say, just stating whats been posted.

and yes, at low rpms, the VC breather sucks, but as high rpms it blows.

can anyone comment on the endyn setup and how its supposed to be setup? someone said my diagram was incorrect, then what IS correct?

 

How to hook it up (directly from Endyn's site)

http://www.theoldone.com/artic...g.jpg

 

thanks. looks like he uses the 2 freeze plugs that are far away from each other, i guess the hole underneath the freeze plug on the tranny side isnt a freeze plug. im guessing its plugged with the endyn kit?

anyway thanks for the pic. but also its noteworthy to say thats a b20 block not a gsr. so it doesn have the breather box or the 2 holes in the block associated with it that gsr/itr blocks have. you can see the holes im talking about in the pic i posted its the top and bottom holes on the tranny side.

i dunno though, im kinda confused on why larry at endyn setup the can on that build the way he did. looking at the other pics he actually used 2 cans. one for the pcv, and kept it an emissions legal setup, but why vent the vc to the intake arm if he has a catchcan on the other side? and why does he have a vent T-ed to the return? on the pcv tank setup?

 

wait a sec... i know for YEARS, this old one dude has been advocating that the catch can MUST have a return to the intake manifold for it to provide vacuum which was so necessary, as he said, and his little lemmings always posted some scanned diagram of what looked like scribble on a napkin as gospel.

and now hes selling a kit that just vents to air?

 

https://honda-tech.com/zerothread?id=1199935

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">
and now hes selling a kit that just vents to air? </TD></TR></TABLE>

It just happens that this kit can switch between venting to air and used as a closed system....



Do you see the PCV included as well as the filter?

He has the drain T'd so under decel this apparently "drains" the can....regarding the whole valve cover venting to the intake arm, it doesn't vent there....

I think we can all collectively agree that under normal driving conditions, the intake arm will provide fresh air to the valve cover, but once you start getting on the gas, the PCV gets overwhelmed and the valve cover vent starts spitting oil.

The way the system is vented from the back =should= enable the valve cover to keep drawing in air without being overwhelmed, you now have two hoses venting pressure instead of this the tiny one that used to feed the PCV valve.....

Larry has the extra can hooked up in front of the valve cover to help in reducing the massive crankcase pressures.... something that could probably help on the stock car anyway.... but as always....I stand corrected if anybody has anything else to offer....

Cheers,

 

why would you even want ANY path of dirty air going back to the engine...

 

........for those unfortunate enough not to be able to afford tow vehicles or their primary method of transportation also happens to be their racecar also... AND they live in regions where emission controls are required....

....you'd think this was pretty clever for a setup no?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">why would you even want ANY path of dirty air going back to the engine...</TD></TR></TABLE>

emissions

 

ignore emissions for this thread please. emissions isnt a concern to me. i just want a setup that will properly ventilate the crankcase and allow ZERO oil/oil vapor into the intake stream. im thinking of getting those freeze plug nipples from honda, plugging up the other holes, and running a can to those 2 plugs as well as the VC breather. but what can has 2 plugs plus a filter on top besides the endyn one? 160 is a tad expensive...