Small block super gas mileage intake?
#615956
02/17/10 07:36 PM
02/17/10 07:36 PM
|
Joined: Mar 2005
Posts: 1,630
North Central Florida
eightlitermopar
OP
top fuel
|
OP
top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
|
Ok, I just picked up an intake for my small block 4 door coronet 1969 coronet four door granny car 318 (currently little 2bbl intake) I have been fighting with the carb, so I have opted to go with a four barrel. I just picked up and intake for $50, but I don't know much about it. CASTING S.P.2.-P. 318 From what I have read, this is a low performer intake, but I think it will work great with my non performance 318. I will be upgrading the cam to a comp stick with .425/.425 lift and adding a 600 cfm carb on top. Should I go one step bigger on the cam? Any input about this intake and my setup? Thanks in advance. eight 
Mopar or no car
|
|
|
Re: Small block eddy intake ID help!
[Re: eightlitermopar]
#615957
02/17/10 08:41 PM
02/17/10 08:41 PM
|
Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
|
Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
|
the SP2P is a "emissions" manifold produced in the mid 70s. it has the 318 ports and works ok to about 4500 RPM. use a 600/625 CFM carb....
good luck
I am truckless..
|
|
|
Re: Small block eddy intake ID help!
[Re: eightlitermopar]
#615965
02/18/10 08:52 AM
02/18/10 08:52 AM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
Quote:
Quote:
no; in normal daily driver duty that SP 2P will be fine. Amall ports for better velocity. I've had that intake, I would use another if I got it.
the one I would like to find/try is an LD4B.
Thanks for the little bit of light throught the dark clouds  I figured I was completely screwed with my new intake! Did you see and increase in gas mileage with this intake?
Anyone suggestions on cam choice for this motor with this intake? I was thinking either
Comp 252H .425/.425 lift with 206* of duration
Comp 260H .440/.440 lift with 212* of duration
thanks for any input!
eightlitermopar
lunati voodoo 60400, use comp #901 valve springs.
for an intake, I'd find a used eddie performer, can usually find them for under $100.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: Small block eddy intake ID help!
[Re: volaredon]
#615967
02/18/10 03:51 PM
02/18/10 03:51 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
Quote:
Don't waste your $ on the 252; I was looking around; compare the specs to a STOCK 360-2 bbl (or only 360 cam, in the 80s truck) cam; other than being 0.015" less lift at the valve (big whup, with your intended use) that cam is dang near identical to the 252. I bought a 360 stock replacement cam for the 318 in my 3/4 ton truck; for $76 vs $145 that 0.015 means nothing. and yes it did make a difference in how my truck runs, hauls, tows.
It is an improvement over the OE 318 cam for sure, but with the 252 all you pay for is the name...... COMP! Duration overlap etc., are dang near identical from what I saw listed for the 252.
advertised duration is similar, but if you look at some of the other timing events, it's not. IIRC a stock 360 cam is ~190-195 degrees duration at .050, or 10-15 degrees smaller than the 252. I bet .2" duration is even greater of a difference.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: Small block eddy intake ID help!
[Re: patrick]
#615968
02/18/10 04:23 PM
02/18/10 04:23 PM
|
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
|
If I were building a 318 for mileage it would have to have a zero deck piston for good quench (like the KB), the late model #302 casting heads (cheap to find) with a little bowl work and a slightly ported SP2P and a 600 holley vacuum with the old redline/weber 3 circuit metering block and a lock-up 998 trans or a manual od 833 with a final drive ratio of around 2.94. The cam would be the old Cam Dynamics 252 which was (IIRC) around 206 @.050, .440 lift single pattern on 112 centers or even the factory 360 2 bbl cam (.410 lift.)
The sp2p was really a great concept, it's just that the port cross section was made about 10% too small...which made it detonation prone at high load and part throttle with 70's style emissions, it'd be perfect on a 273 built the same way.....I'm thinking I could build a 273 that would pull 65mph at less than 2000rpm and get at least high 20's mpg in an A body....or about the same as a 90's era Maxima v6. Keeping it very cool (like under 175 degrees) will go a long way to making the combo work on pump gas too.
I've been looking for an sp2p to play with for such a project.
the LA motor is one of the most fuel efficient v8s made for its time
Last edited by Streetwize; 02/18/10 04:30 PM.
|
|
|
Re: Small block eddy intake ID help!
[Re: DusterKrazy]
#615970
02/18/10 09:21 PM
02/18/10 09:21 PM
|
Joined: Mar 2005
Posts: 1,630
North Central Florida
eightlitermopar
OP
top fuel
|
OP
top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
|
thanks for the reply guys! I know this is a hobby, but some things I hate to do twice (like put a manifold on a small block while in the car!) So here is a scenerio. As I currently stated, I currently have the 1969 318 motor with the stock cam (approx .400 lift from what I have read) the two barrel works, but it does leak and it's not running it's best. What could I expect if I simply put on this sp2p manifold with an eddy 600 cfm carb (adjusted properly of course for elevation). If I changed nothing else, and simply did this change, what would I see? Decrease in power? Would the carb be too much fuel and flood or cause detonation to blow up my motor? Would I pull the front tires off the ground when accelerating  ok, I am not really expecting that. Simple carb and intake swap, nothing else. What would I expect? thanks!!! 
Mopar or no car
|
|
|
|
|
I'll keep an eye out for some iron manifolds in my area, I am kind of on a tight budget. 
