Well I finally got my engine on the dyno today!!! Special thanks to Jim Wiese for building my engine!!!! Engine specs: 1972 350 bored 30 over, T/A 10.25 pistons, (actual compressin is 10.12), Poston GS112 cam, headers, stock valves with pocket porting and bowl cut back with performance valve job, stock rebuilt 750 quadrajet, hei ignition with an MSD 6 box. I also want to thank GSCALIFORNIA for lending me his T/A intake for my testing!!! I started out with the T/A, set timing at 35 degrees all in by 3,000rpm's. First run was Peak HP was 365 at 5,500rpm, torque was 393 at 4,300rpm's, hp avg 322, torque avg 373 between 3,400-5,700 rpm's. Not bad for first run!!! fuel ratio is 10.91-14.05, avg 12.43! Now I put on a 4 hole 1 "spacer and here it is: Peak hp is 371, avg 325. Torque peak is 398, avg 376! Now I switch to an open 1" spacer, I lost 40 lbs of torque at 3,800 rpm's, 391 vs 341!!!! Avg hp is 321, avg torque 372. It did not like the open spacer! Now I swap to the cast iron intake with the four hole spacer. My torque comes in earlier, nice, more bottom end!! At 3,400 rpm's I have 370 lbs of torque vs 360lbs with the T/A! And 239 hp iron vs 233hp T/A! At 4,000rpm the iron is 300 hp and 394lbs torque vs 303hp and 398lbs torque! At 5000rpm's iron is 355hp and 373lbs torque vs T/A 351hp and 369lbs torque! Peak hp and torque in the iron 368hp and 395lbs torque, avg 322hp and 374lbs torque. T/A peak 371hp, 398lbs torque, avg 325hp and 376lbs torque! So there you have it!!! T/A intake $290.00 for an avg gain of 3hp and 2lbs of torque across 3,300-5,700 rpm's! Not a bargain, I will save my money and keep the iron! I only wish I could get my hands on a single plane high rise intake!!!!
Thanks for the real scoop in a real world application!! I know I had asked if they had dyno results when I purchased mine, to support their 25hp claim........... They had no such dyno. I still do like it though for the saving in weight alone!. Mike
Wow. That's a surprise. I didn't expect the TA intake to be so close. Guess I'll just port match the stocker. Thanks for the info.
Thats what I though. Stock iron is as good or better. Until we get a new aluminum single. Why didn't you try a 2in spacer??? I just reeemember from a long long time ago Big Daddy Don Garlet saying a 1 1/2 in - 2in spacer was an easy way to add power. So I allways go for the bigger side of that, though I have no proven results.
Now that we've seen this, I'd be curious to see a dyno of the same engine, with the S-divider, and the same variation on spacers.... I have an S-divider that I purchased years ago, and am wondering if there is any improvement there other than weight savings.........
You're welcome, glad I could help out so we could finally get some REAL results! I didn't check mine with a dyno, simply seat of the pants and 1/4 mile times. I could feel I lost a little off the line when I went to the TA intake, that's why I went back to the stock iron intake. Tim, what did Jim think of the custom 4 hole spacer? My brother Brian designed that from a gasket on his CAD program and had it machined from a solid block of aluminum. Should I tell him to go into production with them?:grin: Glad things worked well for you, I hope you're solid in the 13s! We'll have to line them up some time and run:3gears: Anyone want to buy a slightly used TA intake?:Brow:
Hey guys and gals if you want to have a real rush go have your engine dyno'd! After the 20 minute cam break in I was a little nervous when the dyno guy asked if "I was ready to see how she handles some rpm's??" I nodded a nervous yes and with that he pushed the load button and give her hell!!!! All I could do is watch as my new baby woke up and started screaming against all that load but she grunted a little and then I watched in amazement as the rpm's kept building until she hit 5,200rpm's and shut her down. I anxiously waited while he printed out the first run, he looked at the data and smiled in wonderment as he asked "This is a 350 Buick, right?" I laughed and said "yes why? He said because she just pulled a 356hp run without any tuning! He then said that this horsepower would have been tough getting out of a 350 CHEBBY! With that he said let's take her up to 5,700rpm's and get those rings to seat!!!! WOW, that was exciting and she pulled through with flying colors! I can't tell you the feeling of satisfaction of knowing that it runs with no leaks, the timing is perfect and it is ready to drop in the car and run! I wanted to run a 2" spacer but I ran out of dyno time! I am hoping to drop it in my 72' Vert this weekend and raise a little hell! Beware of a bright orange Convertible when you are driving through MN, chances are it will be me with an ear to ear grin until we hit the next red light then it's"GAME ON" Tim
Id do the spacer from ce phenolic plastic rather then aluminm to stop heat transfer. Or make them out of a wood plastic. [http://www.polymerplastics.com/composite_cce.shtml] That url often sells goofed up sheets real cheap. A few guys on this list run plywood carb spacers for just that reason. . no lie.
Ken, those spacers are really nice, I would like to buy one from you! Yes I would start making those but like Buick_350X says maybe do it in a plastic for heat reasons. I have a buddy who has a company tha makes motorcyle windshields out of plexi, I will ask him if he can make these! I will also show Jim Wiese the spacers and see what he thinks! Again, thanks for the use of the intake! Tim
Spacers I looked up when I designed the carb spacer. It was 06/06/2000. I used a material that I new was safe for gasoline absorbtion and heat. It was kind of a test pilot. Now for production I was use Acetel Delrin It has a melting point of 347 degrees. And according to the book It is rated a "A" for No attack, possible slight Absorption. Negligible effect on Mechanical properties. I have never tested this product for this purpose. So I can't say how long it would last. But It seems like a good start. Tim Thank you for posting those results, That is some great information.
The answer at last! This thread is the answer to a question i ones asked! :beer I'm using a 2" 4 hoal spacer on the 350 4bbl iron intake, i had some thoughts about removing it... but after reading this, i stick with it! I put it on to gain some torqe when my engine was all stock (and so i did). Btw. was the heat riser passage blocked when you did the dyno? Lars :Comp:
Yes, I had my heat riser passage blocked. I wish I would have had more time to try a 2" spacer. This engine sounds very nice, the cam has a pretty radical idle but my switch pitch converter takes care of that at stop lights!!! I have the Flowmaster American Thunder exhaust system with their 30 series mufflers and it sounds nice, not too loud, in fact at highway speeds I can talk to people in the backseat without a problem.
I istalled it last week, it runs well! I have a few bugs to work out, my ignition switch went out on me fixing that tonight. I have a posi with 3.08 gears so I am alittle dissappointed in the low end however my switch pitch will help that. It sure is nice on the highway though, I just have to give it a little gas to pass someone no downshift needed! It is hard to tell how quick she is because my last fun car I had was a 70GS 455 with 4.56 rear end gears and she ran mid 12's! I have a set of 3.42 gears that I might put in next spring to help me off the line. She will lay down some nice tire marks (295/50's) in high stall. I will psot some pictures of my car this weekend! Tim
At what rpm did each of them peak (hp and torque) = was the peak rpm readings close betwen the T/A and the Iron? Is the iron intake port matched? Lars :Comp:
You could still try a 2in spacer and just go by seat of your pants. It isn't really hard to change. I have a 2in on mine and all the stock linkage fits. Though you need longer bolts but its an easy common thread. A few washers will take up any slack.
Thanks Tim For the update. I am still working on my project. I am sending my heads back and plan to install the larger valves. I hope to get around 270's for my flow numbers (Crossing Fingers). Keep up the good work! :3gears:
270 cfm flow!!!!! That will be awesome! Here are the dyno peak numbers. Iron intake peak 367hp at 5,700 rpm's, torque 396lbs at 4,100 rpm's. Torque at 5,700rpm's is 338lbs T/A intake peak 371hp at 5,600 rpm's, torque 398lbs at 4,000rpm's. Torque at 5,700rpm's is 340lbs Tim
Tim, Those are nice numbers for the build. You should have some fun with it. Give the 2" spacer a try. It's an easy swap. Phil, The heads you are looking to flow 270. Any port or bowl work? We had a set flow in the 290's with much, much work and screwed them up trying for the magic 300. It's all in the bowl!!! :TU:
