2x4 intake vs. single 4 intake?? I have been considering trying the offy 2x4 intake for some time. I was wondering how well it works? Does it perform as good as it looks. Or are the dual carbs more of a pain than they are worth?? o No: I am a street/strip guy that drives pretty hard. :grin: :TU: How does the performance of the offy compare to TA's SP-1 or the SPX. (That SPX is awesome looking also :TU: ) I am kinda leaning toward the SPX right now for simplicity reasons. But if the Offy works well, it is a definite possibility. What do you guys think? Either way, it will be a while before I take this step. Just wanted to get some input.
The dual 4 intake doesn't work well in its stock form. There is a member that can modify them and get good results. The floor of the intake is level and doesn't flow well at all. Probably not much of a gain over stock. The TA is a very good flowing intake. Most people on this board use dual plains for their street cars. An older Edel. B4B is a good choice on dual plains. Do a search on this subject and you will find much information.
Thanks alot. I am familiar with the performance of the other manifolds. Just had not heard much about the Offy. Your info has leaned me even more toward the SPX...I am more strip than street. Again, thanks alot.
I'd be willing to bet a PROPERLY tuned dual quad setup would out run a single. Like 2 800 cfm Thermoquads ala Dave McIntosh. Someday, I'll get around to it. Bruce BQUICK JAGUICK....testing at track (no clocks) tomorrow!
You certainly would think that. But if the manifold is poorly designed, you have to overcome alot. Sure does look cool though. Maybe, someone (TA) will design a new one with the proper design for good performance.
I don't know but there was a flow test in an old GSXTRA that said it out flowed all others. Maybe the QUALITY of the flow is the issue..... Bruce
Well, I have one and never installed it after reading many posts on here about how poor they perform. But, Jim Burek sent me a PM about the cost to fix one properly. According to Jim (who knows much more than me), it will run excellent after spending a couple of hundred on it. I will eventually send mine to him, but it is on the back burner at the moment. Now, I have run several on 425's and saw an improvement over single carb intakes, especially the AFB's. You could really feel it when I installed an old Edelbrock dual 4 onto a 425 with new 600 performers.
- Even if it's a bit slower the "cool factor" would certainly make up a couple tenths. Owning a multiple carb car is definately on my list of things to do.
[Owning a multiple carb car is definately on my list of things to do. [/QUOTE] ME TOO!! :grin: :TU: :3gears:
If there is so much proof that these manifolds are so bad, then I must ask, How much horsepower is lost over the stock Buick manifold? Any numbers,dyno test,or the like? Thanks Tom
I think it depends on the level of the engine build-up. A mild engine build-up may gain nothing by going to the Offy Dual Quad. In fact it may be worse. But I remember my friend running the Offy Dual Quad with two Carter CS 750 CFMs on his old street/strip 455. There was NO WAY the stock dual plane with the quadrajet could match / catch that set-up. I don't recall if the Offy manifold itself was modified though. When the Cool Runner made its debut (in the 80's ???), he removed the Offy Dual Quad set-up in favor of the simplicity of the single carb set-up.
Not my car, but another dual quad option done with adaptor plates. I think this was up for sale a while ago in the parts forum.
NOW THAT'S WHAT I'M TALKIN ABOUT!! :grin: :TU: I wonder what the original application for that T-ram was.
I am planning an iron stage 2 headed engine with the help of Charlie Evans. I am planning on running the offy 2x4 with 660 Holley centersquirters. My intake is new,but David McIntosh showed me some of the places for improvement and Charlie has worked on one for Jim Netherlands. Charlie also has a set of adapters for the Mopar intake.I like the straight shots from the carb to the heads.I am not sure it's the best intake,but not many people run 2x4 and I like to be alittle different.Mike Nussell
Here's one company that makes sheet metal intakes and their price list. http://www.hogansracingmanifolds.com/prices.htm
