southwind25 Posted January 15, 2008 Share Posted January 15, 2008 So when we got the car it didnt have the K&N filters mounyed, so thats #4 on the list and we put them on.. But AH HAH! thats why they were not on, the bonnet wont fit now! The filters are about 1/2 to low and wont fit it he opening..drats:banghead: they nearly rest on the frame rail. well ok,,,so what to do? i dont want to start carving up the bonnet. perhaps the engine is mounted a little low for some reason? maybe remake the backing plates so they are offset? but at best when it would be correctly centered the opening is darn small and i can see the paint getting rubbed of REAL quick with vibration and the bonnet would be harder to get off-on anyways. so alternate filters? hey that pipercross unit looks good, what about individual trumpet socks? but how do those individual socks mount? do they interfere with flow much? what pipercross are people using on the 1600 x-flow? any other thoughts or good solutions? Link to comment Share on other sites More sharing options...
Al N. Posted January 15, 2008 Share Posted January 15, 2008 Many of us with ITBs run the ITG foam filters. I'm sure some Birkin folks will chime in here. Link to comment Share on other sites More sharing options...
JohnCh Posted January 15, 2008 Share Posted January 15, 2008 Here's a picture of my old crossflow-powered Westfield with the shortest ITG filter available. There isn't space in there for tradtional trumpets, but TWM makes 12mm shorties that did the job. As you noted, you can always get a blank backing plate and drill it to create an offset. http://home.comcast.net/~cobar/images/itg.jpg -John Link to comment Share on other sites More sharing options...
11Budlite Posted January 15, 2008 Share Posted January 15, 2008 I'm sure some of the problem is caused because you're running a crossflow and most Birkin's came with a Zetec. You're bonnet probably has a rolled edge which makes it more difficult to modify and you probably wouldn't want to modify it anyway. When I went to ITB's I had to cut the opening in the bonnet to fit the K&N's I wanted to use, but I left minimal clearance between the filters and bonnet just in case I wanted to roll the edge at a later date. It actually doesn't look too bad with just the plain edge. Like you said you can modify the backing plate and stick with K&N's, go to ITG or Pipercross, or Pierce manifolds has a selection of filters including the sock type here: http://www.piercemanifolds.com/airfilters.htm I don't think that the screen type filters that go on the end of the velocity stack would be good for filtering or flow. It might be worth posting this on the yahoo.birkinowners site to get a wider range of opinions from Birkin owners that could be running crossflows. Hope this helps, Bruce :7fume: Link to comment Share on other sites More sharing options...
southwind25 Posted January 15, 2008 Author Share Posted January 15, 2008 pardon my naivity,,,what is "ITB"? Link to comment Share on other sites More sharing options...
Al N. Posted January 15, 2008 Share Posted January 15, 2008 ITB= individual throttle bodies These are used in some FI setups, and sport intake trumpets much like good old carbs. Tim W. runs mesh filters on his Datsun powered Birkin. I recall that he had these little plastic "booties" he threw on them when the car was sitting. Link to comment Share on other sites More sharing options...
southwind25 Posted January 16, 2008 Author Share Posted January 16, 2008 We think we are going with the individual stack socks type. they have a lot of flexibility as far as mounting goes. UNI filter looks like they make some good ones used for moto-x that will work for us. they have a good solid mounting scenario, we dont want to just tie wrap something on. we might even screw around with making a little neat air scoop, but thats way down the list. Link to comment Share on other sites More sharing options...
southwind25 Posted January 24, 2008 Author Share Posted January 24, 2008 New UNI filter socks installed. they seem to fit great, and the installation was easy, lightweight and the product well made. I'm happy with these. http://www.usa7s.com/aspnetforum/upload/1964293606_IMGP2213.JPGhttp://www.usa7s.com/aspnetforum/upload/1143021319_IMGP2214.JPG Link to comment Share on other sites More sharing options...
Kitcat Posted January 24, 2008 Share Posted January 24, 2008 Looks great sitting still . But, I will be interested in any fuel "blowback" you get thru the socks once underway. A persistent problem (or part of the car's charming character, depending on your point of view) with my Crossflow is the mixture of fuel & airfilter lube that gets discharged out of the carbs, thru the K & N filters and onto the clam, passenger side of the windshield & rear wheel arch. Put-putting -no problemo. High RPMs-lots of blow-back, esp on long trips or at the track. If the filters are perfectly seated, clamped down, well oiled etc., problem is lessened. But, at every fill-up, I am cleaning a bit of gunk off the passenger side of the car. If the socks eliminate the problem, I will ditch the K & N's. Link to comment Share on other sites More sharing options...
southwind25 Posted January 24, 2008 Author Share Posted January 24, 2008 blowback?http://www.usa7s.com/aspnetforum/upload/209114026_moss_stirling.jpg Link to comment Share on other sites More sharing options...
BobDrye Posted January 24, 2008 Share Posted January 24, 2008 blowback?http://www.usa7s.com/aspnetforum/upload/209114026_moss_stirling.jpg That's also what you look like after flying a tractor prop ultralight. You also can leave your Brylcreem at home. Remember a little dab will do ya. Link to comment Share on other sites More sharing options...
slomove Posted January 24, 2008 Share Posted January 24, 2008 .......... A persistent problem (or part of the car's charming character, depending on your point of view) with my Crossflow is the mixture of fuel & airfilter lube that gets discharged out of the carbs, thru the K & N filters and onto the clam, passenger side of the windshield & rear wheel arch.......... I had that a lot when I was still running Webers. However, that was mostly related to the crankcase vent routed into the rear K&N air filter box (without catch can). With spirited driving on curvy roads and the related sloshing/churning in the crankcase the oil was just puked into the air filter and sprayed all over the passenger side. Once I installed a catch can it was much reduced and after I shut off the crankcase vent (only venting from the cam cover) that was gone. I have a Zetec but read some people with Crossflows have done the same. Anyway, I don't know your configuration but thought it might be related? Gert Link to comment Share on other sites More sharing options...
Ian7 Posted January 25, 2008 Share Posted January 25, 2008 " and the related sloshing/churning in the crankcase the oil was just puked into the air filter " huh? Link to comment Share on other sites More sharing options...
southwind25 Posted January 25, 2008 Author Share Posted January 25, 2008 As time goes on and if we get the opportunity. We will eventually put a windage tray and baffle-trap door the pan. Sure a dry sump would be great...but a bit of pan work is much cheaper. Maybe add a accusump-preoiler. anyways.. we also might play around with a possible hood scoop-air box plenum to cover the stacks..so it contains the mess. problem is making one so it doesnt look obnoxious yet fit the opening in a non destructive way, and still give room to breath. Link to comment Share on other sites More sharing options...
Kitcat Posted January 25, 2008 Share Posted January 25, 2008 On my car the crankcase is vented to its own catch can-never a drop in it. The guys at RMSC say it's the carbs sticking out in the airflow giving up a bit of gasoline. Link to comment Share on other sites More sharing options...
Birkin42 Posted January 25, 2008 Share Posted January 25, 2008 With the individual UNI filters it doesn't look like you have any kind of filter for the air inlet to the float bowl and air jets. That is the round hole just between the trumpets. I believe air is taken in here to feed the air corrector jets as well as vent the float bowl. I would think it would be a good idea if you try to keep dirt out of here. I also believe it is important that any pressure drops from filtration be about the same between the trumpets and this breather to not through off the jetting. I have not worked with DCOE's for quite a few years now, but this is what I recall and thought you may want to investigate this further. Sounds like you are having fun with your new car. Link to comment Share on other sites More sharing options...
11Budlite Posted January 25, 2008 Share Posted January 25, 2008 :iagree: Link to comment Share on other sites More sharing options...
southwind25 Posted January 25, 2008 Author Share Posted January 25, 2008 Indeed you are correct! The UNI kit of 2 filters included a little filter element that you place in the vent passageway. Well we are not having the fun of driving it yet...darn ohio road salt. :nonod: But we are having the fun of screwing around with making things better/correct before we drive it! Last night i welded up a new offset brake pedal so that they are evenly spaced for my feet, and made a set of hub centers (hubcaps?) for the wheels since it only came with 2 . they are a knock off spinner looking deal now that fits in nice with the quasi spoke wheel the car came with. i would still rather have nice panasports on her.. Link to comment Share on other sites More sharing options...
slomove Posted January 25, 2008 Share Posted January 25, 2008 " and the related sloshing/churning in the crankcase the oil was just puked into the air filter " huh? To be more precise.......I am mainly talking about track driving. Installing an engine lengthwise that was designed to be installed crosswise in the car will make the PCV outlet to be wetted with oil occasionally at high revs and lateral acceleration (especially without windage tray). I suppose the blowby pressure then just pushes some oil out. No big deal with a catch can. But the experts who put my car together decided to run the PCV outlet into the air filter without a catch can which was quite messy on the track. Link to comment Share on other sites More sharing options...
Birkin42 Posted January 25, 2008 Share Posted January 25, 2008 Our roads in Ontario are bascially white right now and my blue truck looks like a salt lick. Definitely a good time to have prized cars stored away. Your Birkin is a bit older then mine, but I would assume the pedal assembly is more or less the same. With mine you swap the pads on the pedals side to side, flip them over as well as move them up and down so that you have a fair bit of flexibility to space the pedals as you like as well as set their height. Thought this might help if you didn't know the flexibilty that Birkin designed into the pedal assembly. Link to comment Share on other sites More sharing options...
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