Drag Racing Discussions > Front Engine Dragsters
Making a intake manifold for my 4-71 blower
GlennLever:
There is also a Mini brust panel. I thought of usinging in my application but was unsure how track inspectors would look at it
"SFI approved mini burst panel. This panel is a must for high boost applications and will keep the supercharger and manifold damage to a minimum. If the engine over revs or engine tune up is not at maximum performance. Mini panel measures 4.250" x 2.375" and has eighteen mounting holes. "
http://www.rbssuperchargers.com/Products.cfm?pn=2000-0001M&pID=8353
denverflatheader:
Sidewinder - yes, when she together and ready for 1st outing, I’m guessing alky should work hunky-dory. Each pass will provide more confidence.
"Excellent source” shared with me on his blown injected fh, straight alky ran so smooth once dialed in (like bracket car). Then switching to “pop” look out as that’s when “trouble” reared its ugly head (lean-rich cylinders imbalance), but worth it, et-mph wise. Your crew chief knows, best to ease into “snap crackle pop” and adjusting timing to hit the mark : ) I know it's a way off but fun to "dream" about it : )
You might consider asking “Spud” for his thoughts too on your plenum design. He probably already knows what works good, and more importantly, what will work better for 4-71, and 255-286 cubic inches. I only spoke to him once on the phone, and can tell he has it together upstairs.
Glenn – I didn’t know about those baby burst panels. Ideal to pair them up, one on each side versus a larger one in front…… simple way to lower plenum height. Seems to me two panels opposite and inline with intake ports is better design than just one in front. DF
Sidewinder:
Thanks Glenn & DF on your inputs!:) Spud has answerd me on some magneto issues, so now I have solved foult nr. 3. With all these issues solved I'm optomostic on taking the "winder" faster down the track:) Last year we whent to the HAMB drags, I bought a couple of pop-off plates, one Cragar and one Weiand (say-why-and), and was thinking of useing the Weiand, and switch to burst. I thinks they have the same size.
We have made new rules, so pop-off is still leagel here:)
The plenum might not be perfect or 100% ideal, but there are some stuff we need to compromise on. We plan to have the plenum approx. 1- 1 1/2 inch high abowe the runners. Roger has the intake now for some more welding, but hope to have it back soon for some more grinding, then he could fit the plenum. We allready had the top-plate, as it acted as a spacer on the old one:)
Anyone have any idea what sparkplugs to start with? NGK BP5ES? I have allways used Champion on my gas engines.
Kjell
denverflatheader:
Sidewinder - I’ve only made a few parts from aluminum alloy, always used 6061-T651. Though my mid-plate for the six is 7075-T651. I’m probably luckier than most, as there is an aluminum recycling business a few miles down the road. They have new, used, leftover just about anything you can think of, round, tube, square, flat, etc. They’ll also do minor cutting and braking for you. They sell by the pound, and I’m usually spending under $20 for what I need. They have these racks with small cut pieces, usually can take my cardboard template and match up a pre-cut piece real easy.
I’d have to say of all the things I’ve had to do on the dragster, ranking right up there is deciding and designing those little aluminum pieces are most fun. Your making a blower intake, lots more fun, and more complicated. That’s one definition of the word “custom.” DF
ricardo1967:
--- Quote from: Sidewinder on March 18, 2013, 03:10:16 PM ---Thanks Glenn & DF on your inputs!:) Spud has answerd me on some magneto issues, so now I have solved foult nr. 3. With all these issues solved I'm optomostic on taking the "winder" faster down the track:) Last year we whent to the HAMB drags, I bought a couple of pop-off plates, one Cragar and one Weiand (say-why-and), and was thinking of useing the Weiand, and switch to burst. I thinks they have the same size.
We have made new rules, so pop-off is still leagel here:)
The plenum might not be perfect or 100% ideal, but there are some stuff we need to compromise on. We plan to have the plenum approx. 1- 1 1/2 inch high abowe the runners. Roger has the intake now for some more welding, but hope to have it back soon for some more grinding, then he could fit the plenum. We allready had the top-plate, as it acted as a spacer on the old one:)
Anyone have any idea what sparkplugs to start with? NGK BP5ES? I have allways used Champion on my gas engines.
Kjell
--- End quote ---
Sidewinder - I'd think that the NGK BP5ES plugs are a little too warm for a racing environment. Even some factory cars in Brazil were fitted with colder NGK BP6ES or even NGK BP7ES (for ethanol, with 12.3:1 compression). I personally have gone as cold as '9' on street/strip turbocharged engines. The FED currently has NGK R5672A-9 on an alky SBC 400, AFR 220 heads, with ~12.5:1 compression.
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