2.8L intake
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2.8L intake - 8/18/2008 4:57:31 PM
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bobditts
Posts: 681
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Im not sure if this is the MOST appropriate location for this thread, so if it needs to be moved please do. Im looking to upgrade/replace my stock 2.8L intake and air ducting (leading up to the filter). Ive done a little searching on the net and on this site and really havent been able to find much. Any suggestions? Thanks!
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RE: 2.8L intake - 8/18/2008 5:02:48 PM
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Blazin_Jason
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From: Van Isl, B.C.
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This or this, or you can also go to an open element air cleaner.
_____________________________
85 S10 Blazer 4x4, 2 door, undergoing 350 swap, 3" BL, 33''''s
89 Jimmy 4x4, 2 door, 4.3/auto
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RE: 2.8L intake - 8/18/2008 7:29:50 PM
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bobditts
Posts: 681
Joined: 10/16/2007
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oh great, thanks for that info. I didnt know that s-10 forum existed. One question though, Inbetween the stock filter and the air inlet tubing there is a piece that has a tube (vacuum im assumin) and a metal flapper inside the tube. Not sure if that make sense. What do I do with the tubing (vacuum) if I make my own CAI?
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RE: 2.8L intake - 8/18/2008 8:01:09 PM
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bobditts
Posts: 681
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oh, also, if I get the TBI plenum, do I have to worry about the TBI spacer Im installing? Will that cause issues with the fit of the plenum?
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RE: 2.8L intake - 8/19/2008 3:38:19 PM
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bobditts
Posts: 681
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So I think I answered one of my questions and came up with a new one at the same time. Im pretty sure the spacer wont matter because the filter housing sits on top of the TBI, not around it. Here is my new quesiton though...... I read that if you flip the lid on the filter cousing to allow more air in, you get a slight performance gain. Well I tried it out and now my blazer is throwing a CEL ????? Any idea why?The wierd part is that it doesnt come on right away, I have to drive around for a mile or 2 first, then the CEL lights up.
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RE: 2.8L intake - 8/19/2008 4:41:46 PM
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Blazin_Jason
Posts: 1061
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From: Van Isl, B.C.
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I think the vac hose you talk about opens that flapper and closes it when it''s warmed up. If you add a spacer it might raise the plenum hat up and hit the hood, but I can''t say for sure or not. I flipped my lid just for the hell of it, and I like the sound it makes. Mine hasn''t given a code nor have I read it creating a code for others. Maybe check to see what the code is.
_____________________________
85 S10 Blazer 4x4, 2 door, undergoing 350 swap, 3" BL, 33''''s
89 Jimmy 4x4, 2 door, 4.3/auto
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RE: 2.8L intake - 8/20/2008 8:34:15 PM
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neo71665
Posts: 304
Joined: 12/18/2007
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I''m running an open 10 inch with a k&n on mine with no problems. The vac hose and piping your talking about is the preheater. 99% of the time after a few years that stuff stops working anyways and you''ll never notice it missing.
As for the code, make sure you didn''t bump any vac lines or electrical connectors loose while you were messing with it. Pull the code and tell us what it is and we can help you more. If you don''t know how to pull the code here:
http://www.s10forum.com/forum/f106/how-to-pull-your-ses-or-check-engine-light-codes-343044/
FYI, don''t waste your time or money on the spacer. Been there, done that, been long removed and trashed.
_____________________________
1987 s-10 blazer 4x4, 2.8, 700r4, np207, 3.73 gears with a few mods.
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RE: 2.8L intake - 8/20/2008 9:12:54 PM
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bobditts
Posts: 681
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The preheater hose is different than the vac line going to the flapper Im talking about. Is the flappers only purpose to assist the preheater? If so, when I go to the CAI, the flapper can be left out, and the heater hose replased with a crank case filter.... correct?
I thought about going open air element filter like you mentioned, but all that does is suck up the hot engine air.... unless you have a functional hood scoop.
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RE: 2.8L intake - 8/21/2008 5:05:28 PM
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neo71665
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The preheater mess can be plugged and left off, the crankcase vent (coming from the valve cover to the breather) needs to be left and piped into the ductwork of a CAI or if you like cleaning oil off the side of your motor use a filter vent you can buy at any parts store. The flapper only opens and allows trapped hot air from the manifold to enter the motor, supposed to assist on cold mornings or some trash.
My only option was to run an open air breather. With 4x4 I have no room for a CAI and heat shield on the drivers side cause my vac resvoir and overflow tank is in the way. I''''m still pondering on how to move stuff around one year later to have one. As for a hood scoop I''''m planning on getting a cowl hood one day. Untill then this cleans up my motor bay a bit and allows me to show off my fiero covers and the polished intake manifold if I ever get doen with it.
< Message edited by neo71665 -- 8/21/2008 5:07:18 PM >
_____________________________
1987 s-10 blazer 4x4, 2.8, 700r4, np207, 3.73 gears with a few mods.
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RE: 2.8L intake - 8/21/2008 8:32:41 PM
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bobditts
Posts: 681
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does a cowl induction hood really supply cold air into the engine bay, or is it just for looks? Doesnt seem like it would do much since the opening is facing the windshield and the vehicle moves in the opposite direction most of the time. Good point about 4x4..... I will have to take a look under my hood since Im in the same boat and figure out how to route a CAI as well.
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RE: 2.8L intake - 8/22/2008 5:30:23 AM
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swartlkk
Posts: 14308
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From: Waterloo, NY
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If the hood has a passage from the underside to the back of the raised area, it is possible to pull air from the high pressure region at the base of the windshield. The change of angle between the hood and the windshield makes for a higher pressure region at the base of the windshield. The hood would have to be sealed against the top of the firewall as to not vent hot engine bay air. The intake would then have to be sealed against the opening to the passage to the back of the hood.
It would take some customization to make it work properly. Cowl hoods look nice on the blazers though!
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Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: 2.8L intake - 8/22/2008 7:52:58 AM
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bobditts
Posts: 681
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indeed they do. I love the look of a subtle 2" cowl on trucks in general. Anything more is just too much IMO. That seems a bit complicated though swart. Would it be easier to pull in fresh air from the front of the vehicle (the grill) and use the cowl as an escape for the hot air? (similar to opening windows on either side of your house to get a cross breeze).
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RE: 2.8L intake - 8/22/2008 7:58:34 AM
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swartlkk
Posts: 14308
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From: Waterloo, NY
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Depends on the design of the hood. If you already have a round air cleaner, then all you have to do is seal it to the underside of the hood.
_____________________________
Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: 2.8L intake - 8/22/2008 1:07:42 PM
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bobditts
Posts: 681
Joined: 10/16/2007
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Hm Good info. I think Im going to give the CAI a shot if I can find the proper TBI bonnet at a junk yard and if I can find room under the hood. I could always relocate the battery. So swart, would it be safe to say that I can just stick a crank case filter in place of the pre heater hose in conjunction with the CAI? Do you foresee any issues?
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RE: 2.8L intake - 8/22/2008 2:06:36 PM
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swartlkk
Posts: 14308
Joined: 5/1/2005
From: Waterloo, NY
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Doesn''t the preheater hose just go down to the heat shield on the driver side exhaust manifold? That is where it went on my old ''85 S10 2.8L.
As far as the crank case vent goes, yeah, you should be fine to just put a filter onto it. The PCV valve should still draw off of intake manifold vacuum.
_____________________________
Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: 2.8L intake - 8/22/2008 2:27:28 PM
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neo71665
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quote:
ORIGINAL: swartlkk
Doesn''''t the preheater hose just go down to the heat shield on the driver side exhaust manifold? That is where it went on my old ''''85 S10 2.8L.
As far as the crank case vent goes, yeah, you should be fine to just put a filter onto it. The PCV valve should still draw off of intake manifold vacuum.
Yes on the preheater hose.
For the cranck case vent you can put a filter on it and it will work but every 2.8 I''ve went that route with it spits oil out bad. I''ve found it to run a bit better with the vent being helped by the suction on the incoming air also.
_____________________________
1987 s-10 blazer 4x4, 2.8, 700r4, np207, 3.73 gears with a few mods.
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RE: 2.8L intake - 8/22/2008 3:08:55 PM
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bobditts
Posts: 681
Joined: 10/16/2007
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I thought it went directly to the engine, but it could be the exhaust manifold. So Do I just plug it then? I guess my ultimate question is what do I do with the enigine side of the preheater hose and the vacuum line (for the flapper) if I go the CAI route?
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