This weekend I will see if the victor junior runs better with my combo.:16suspect True comparison, same everything else, except the weather, I don't know what it will be, or what it was before. I am thinking she will want to be jetted up a bit. I'd need mid six second runs to be competative in my class. I'm about 3 tenths to slow right know.
I don't think that a Vic Jr is going to get you 3 tenth unless you have a cast iron factory intake. Keep in mind that a single plane will give more on the top end but you will need a strong combo for the bottom end to still perform. Just like a carb we can over intake as well. Good luck and keep everyone up to date has to how you are coming along. Bossmav
I had a performer rpm with the divider trimmed 1/4". With a 100 shot plate sytem. Hopefully the swap will get me a .1 with the tune on it now and annother .1 with some tuning. I cant wait to see the results.
I lost 3 tenths with no spacer and 2 with a 4 hole 1" spacer, over my RPM Air Gap. But Mine is All Motor. Spray may be a different animal.
Killercomet If you do not mind, would you tell your shift points and what rpm you cross the finish line? thanks. And was that et loss the 1/4 mile or 1/8th mile?
I too had lost some ET with the victor Jr. Mine was a very mild 306, though...runs 7-teens in the 1/8. It takes a very serious 302 to actually make good use of a victor Jr intake. Alcohol engines should respond well to the Jr but I have not yet tried it on mine.
[Alcohol engines should respond well to the Jr but I have not yet tried it on mine.] What have you not tried on yours? Alcohol or the JR?
The car is currently running a 850 CFM alky carburetor on an RPM intake. Would like to try a Victor Jr intake some day, but don't want to shell out nearly $300 for an intake manifold to "just try it".
I'm not trying to take anything away from the Vic Jr. I love mine! (427 cid stroker, 656 in, 658 ex, solid roller cam and lifters, Roller rockers, Vic Jr 3 stage ported and polished heads, Hooker 6208 headers, total compression 12.5:1 with block decked @ zero, and of course my 850 holley) This intake is made for a very strong motor, now I'm not saying yours isn't, but you want the best of both worlds I would go for the air gap, pricey but a much better combo for a street/strip machine. As always just my .02 Bossmav
I have wondered if the RPM manifold will work better from 4000 to 7500 rpm's? More TQ at the lower range and maybe better avg HP? I wish for a engine dyno
I'd like to see the Torker 289 compared on the track to an RPM. I ran a T289 on my 306. I changed to an RPM because of all the wider power band hype... It $ucked bad. I had to put a 2" open spacer on there to get a similar "seat of the pants" feel. I never got to try it on the track, but it certainly 'felt' seriously lazy compared to the T289. Of course I put the Torker back on. Never looked back for an RPM ever since. The T289 is a single plane, but is not as aggressive as the Vic jr.
I also used a T289. It was "ok". The RPM made more overall power but it didn't have the top end punch. Low(er) speed driveability was MUCH improved, I'd say a good 20-40 lb-ft more below 3000 RPM compared to the T289. And in reference to the post about a victor Jr on a 427, well, you can't compare that whatsoever. The name on the intake is the same but the runners are much longer and shaped completely different than a 302/289 victor Jr. You can easily get away with a Victor Jr on a stone ass stock 351w but a stone stock 302 (heck even a mild 302) will probably hate it. Keep in mind that a 302 is a very narrow engine, which means the runners on the intake are very VERY short. The inside runners on the 302 victor Jr are only about 4" long from plenum to head. In general, short runners equal great top end HP at the expense of low end and mid range power. For most of us who own/drive mild (relatively speaking) engines, a longer runner will provide us with more power in a useable RPM range--ESPECIALLY on a street car. You can also "get away" with using a much larger carb on a dual plane intake than you normally would think. You can easily run an 850 on a 302 with an RPM intake. Heck when my brother campaigned my Mustang, he ran a 1050 Dominator on it just to prove to everyone that it COULD be done and could be made to work. Swapping back to a 750 actually lost a little MPH (mph is an indication of HP) and ET did not change one bit. He was actually quite successful with it. Of course the 1050 disappeared and a 750 gas carb went back on and stayed until I got the car, now it has a 850 alcohol carb with the RPM intake. Back to alcohol--on mine, it makes great low end and mid range but the carb runs a little fat on the top end (air bleeds too small) so it didn't pick up much ET or MPH compared to a gas carb. But the thing with methanol is that it does a great job of increasing torque throughout the RPM range, well, up to an extent where the induction system will no longer support the amount of air/fuel required to support XXX amount of power. Plus, there is twice as much fuel in the runners as compared to gas...and that gives it more weight/inertia. More interia means it will retain it's velocity easier. More volume means that you can get away with a much larger/shorter runner to help the "ram" effect. So in this case, theoretically a Victor Jr intake manifold would probably work pretty good. It also depends on the cam profiles. A short duration lower RPM cam will not benefit as much as, say, a longer duration "higher RPM" grind generally speaking. Or maybe I'm completely wrong but someone correct me if I am. And give me sources to back it up.
