General Category > Quadrajet Carb Talk and Tips
Edelbrocl 1910
kelley555:
Here's a couple pics more of my engine assembly.Later kelley
Cliff Ruggles:
Nice pics. What is the CID, compression ratio, cam specs and type of cylinder heads? Are you using an open spacer on a dual plane intake?.....Cliff
kelley555:
Cliff,it's is 415ci. ;9.5 to 1 static & around DCR 7.7 to 1 with the Crane #119691 .548/.558 lift w 1.5 ratio rockers(mine are 1.6 Int. & exh.,so .585/.595 lift ;234/242 dur maybe add 2-3 degrees with 1.6 according to Crane;advertised 296/304 dur &76 0verlap;with a normal sbc ci. (2800min.-6800 max. 7200 valve float). The heads are AFR 195 Eliminators(street pkg. with 2.05 Int,/ 1.6 exh.) they flow 280 Int./218 @.550 lift (@ 28" h2o) with 1"3/4 exh. & 4.00 bore my bore (4.125 bore & dynatech coated stepped 1"3/4 to 1."7/8 headers).The exhaust concerns me but the guy out of Kansas has 5 chevelles & swears with 2"1/2 mandrel bend exhaust it will flow as good a 3" regular bent system & without being noisey,so you can carry on a conversation or drive the wife out of the loud car. As far as the intake,I went to a head port guy & he say all the dual planes past 6000-6500 won't hang.(your's does) I was going to buy an Edel.Performer Air Gap but the older Holley Contender port volume is supposedly bigger,even an Afr guy told me that. I added the q-jet open adaptor to increase the plenum size.It may not work.The Holley intake has a divider all the way to the top,so with the open adaptor,I guess the plenum is bigger & kinda like the Edel. air gap. A lot people say the bigger motor's a intake "hogg,try to use a single plane.(you have a big motor & no single plane). A single plane intake may work better but it's a Ac car & the dual planes have the oem tapped intake/ac bracket. Lingenfelter was high on the Holley Contender(just off idle to 7200rpm)sounds like bs,pretty broad. I guess I need to have a Edel. Performer rpm air gap flowed compared to this Holley Contender/Street dominator,same part #. I have an extra Holley Intake that I could flow & compare to Edelbrock to see who's Bsing. In the old days ,I used a 2" spacer on the Holley Strip Dominator,but I had a 5500 stall & .700 lift & lauched higher. A little playing with & tuning. Do you see the q-jet adaptor could pose a problem.Later kelley
kelley555:
I forgot,the piston is .005 in the hole + .038 thick gasket = .043 quench(4340 steel rods) .The Afr heads a 75cc head with a Srp inverted Dish piston, -16cc. Later kelley
Cliff Ruggles:
Nice engine combo. The dual plane intake will work fine. The small amount of top end power you give up clear up at 6000rpm's or so is offset by strong low and mid-range power.
I've never tested a single plane intake yet that made more "average" power in engines designed to make peak power around 5000-6000rpm's.
The single plane intakes show NOTHING below about 4500rpm's on the dyno.
Also keep in mind, that the engine spends very little time up near the shift point in a drag race.
I've done a lot of spacer testing. They can make more power, but it really takes back to back track runs to see which one works the best?
I don't like the fully open ones on dual plane intakes. We saw a LOT of torque lost in some recent dyno testing using one, even though it made a few more HP on the top end.
You can also experience some "turbulence", which shows up as hesitation/stumble/bog when you go quickly to full throttle.
The best spacer I've tested to date was semi-open. Basically divided across the front, and open between teh secondaries.
My own intake is fully divided, with about half a 50 cent piece cut out between the secondaries with no spacer. It made the quickest runs at the track over all the spacers I tested, even though it was almost 2mph slower than the semi-open spacer......Cliff
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