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Search found 880 matches

by 427dart
Fri Sep 17, 2021 3:45 pm
Forum: Engine Tech
Topic: Question for the Mopar Hemi experts...stock Hemi intake?
Replies: 9
Views: 471

Re: Question for the Mopar Hemi experts...stock Hemi intake?

tjs44 wrote: Fri Sep 17, 2021 3:15 pm So you are using the front carb primarys to feed the whole plenum for street driving?Interesting.Tom
Yes exactly like Ford did on the FE 427 and Chrysler on the 426 Street Hemi. Just took me 10 yrs to try this little plenum idea :lol:
by 427dart
Fri Sep 17, 2021 12:01 pm
Forum: Engine Tech
Topic: Question for the Mopar Hemi experts...stock Hemi intake?
Replies: 9
Views: 471

Re: Question for the Mopar Hemi experts...stock Hemi intake?

Well installed my modified spacer yesterday and took it out for short 2 laps around the block this morning. Right off I noticed the idle bumped up 150 RPM before engine was up to running temp. Seemed smooth the idle a bit and throttle response was stronger and pulled noticeably more with same thrott...
by 427dart
Thu Sep 16, 2021 12:36 pm
Forum: Engine Tech
Topic: Question for the Mopar Hemi experts...stock Hemi intake?
Replies: 9
Views: 471

Re: Question for the Mopar Hemi experts...stock Hemi intake?

Yep my thought was maybe a bit more power and better fuel distribution at part throttle. At WOT maybe the flow thru the other secondary bores is to great to make the crossover. Going to try that idea on the primary carb 1 inch spacer on my dual quad setup. I have several spacers laying around.
by 427dart
Thu Sep 16, 2021 11:08 am
Forum: Engine Tech
Topic: Question for the Mopar Hemi experts...stock Hemi intake?
Replies: 9
Views: 471

Question for the Mopar Hemi experts...stock Hemi intake?

Always wondered why Chrysler notched the primary bore location of the rear carb location only on the Street Hemi intake.
Any idea?
by 427dart
Tue Sep 14, 2021 11:53 am
Forum: Engine Tech
Topic: Jon Kaase tips and tricks
Replies: 12
Views: 1472

Re: Jon Kaase tips and tricks

Great ideas there....thanks for sharing Bob!
by 427dart
Tue Sep 14, 2021 8:33 am
Forum: Engine Tech
Topic: Holley 4224 vs. 1850 needle and seat ?
Replies: 0
Views: 142

Holley 4224 vs. 1850 needle and seat ?

While looking online for spare needle and seats I noticed the R-4224 660 takes a different part no. seat assembly Holley 6-508. The other side hung carbs like 1850 take a Holley 6-506. Both are adjustable and have same .097 metering hole. Only thing I see different is the 6-508 has the small spring ...
by 427dart
Sat Aug 28, 2021 7:26 pm
Forum: Engine Tech
Topic: Understanding dyno results after a final drive ratio change
Replies: 31
Views: 1272

Re: Understanding dyno results after a final drive ratio change

Let me throw this wrench in the gears of thinking....What would be the minimum amount of engine dyno power needed to see 450 HP at the wheels? How does the old Clayton chassis dyno used in the 70's compare to a DynoJet? Going thru some of my old High Performance CARS magazines I saw where they were...
by 427dart
Sat Aug 28, 2021 4:36 pm
Forum: Engine Tech
Topic: Can a cheap electric leaf blower add power?
Replies: 8
Views: 578

Re: Can a cheap electric leaf blower add power?

Yeah...I watched that show this morning and it made think of the test I did 20 yrs. ago.
by 427dart
Sat Aug 28, 2021 2:54 pm
Forum: Engine Tech
Topic: Can a cheap electric leaf blower add power?
Replies: 8
Views: 578

Re: Can a cheap electric leaf blower add power?

Did you use a 1/4 mile long extension cord on track outing days? No I used a power invertor! :lol: Well some of that increase might be seen from the flow of air to the engine while at speed. Was a cool little test though! 2 years later I made the factory Bullitt hood scoop functional piping the flo...
by 427dart
Sat Aug 28, 2021 2:51 pm
Forum: Engine Tech
Topic: Understanding dyno results after a final drive ratio change
Replies: 31
Views: 1272

Re: Understanding dyno results after a final drive ratio change

Let me throw this wrench in the gears of thinking....What would be the minimum amount of engine dyno power needed to see 450 HP at the wheels? How does the old Clayton chassis dyno used in the 70's compare to a DynoJet? Going thru some of my old High Performance CARS magazines I saw where they were ...
by 427dart
Sat Aug 28, 2021 1:37 pm
Forum: Engine Tech
Topic: Can a cheap electric leaf blower add power?
Replies: 8
Views: 578

Can a cheap electric leaf blower add power?

Well it did during one of my 2001 Mustang Bullitt dyno tests 20 yrs ago ! This was on my stock 2001 Mustang Bullitt with the 4.6 SOHC V8 with a chip tune and a air filter modification. The cheap electric leaf blower was connected to the filter location on the next run on the left. Notice how the pow...
by 427dart
Mon Aug 02, 2021 9:52 am
Forum: Engine Tech
Topic: Dynojet power numbers and tire size?
Replies: 4
Views: 243

Dynojet power numbers and tire size?

If you make a dyno run with a certain size and weight rear tire combo and than later make another run with a smaller lighter weight tire what effect if any on the new dyno numbers?
by 427dart
Wed Mar 31, 2021 3:23 pm
Forum: Engine Tech
Topic: Flowmaster Pro Series laminar flow mufflers?
Replies: 8
Views: 896

Re: Flowmaster Pro Series laminar flow mufflers?

I have been curious about these mufflers as well but haven't found much real world info, just manufacturers info which is geared to sell. Does the performance seem good compared to prior mufflers? Well the butt dyno indicates a bit more pull. I was able to get just a bit more throaty sound which is...
by 427dart
Fri Mar 26, 2021 5:43 pm
Forum: Engine Tech
Topic: Flowmaster Pro Series laminar flow mufflers?
Replies: 8
Views: 896

Re: Flowmaster Pro Series laminar flow mufflers?

Well since NOBODY replied I will give my opinion on these 3 inch Pro Series mufflers. If you want the quietest 3 inch exhaust system on a 500-600 HP street/strip car I recommend these mufflers. Just got it finished up and has a moderate rumble but nothing like the old Flowmaster stuff quieter than s...
by 427dart
Sun Mar 21, 2021 9:54 am
Forum: Engine Tech
Topic: Flowmaster Pro Series laminar flow mufflers?
Replies: 8
Views: 896

Flowmaster Pro Series laminar flow mufflers?

Looking at the 12 inch shortie version round case 3 inch pipe size. Any flow tests done on these and any folks here try them. Will be running them on my 550 HP street/strip use 1985 Mustang. Supposed to be the quieter type muffler with great exhaust flow. Over the past 35 years I have run just about...