Quarter Eights Drag Racing Club

Dragracing friends that became a club. Established 12/08/09 Over 70 Members
 
HomeHome  FAQFAQ  MemberlistMemberlist  RegisterRegister  Log inLog in  
Club will meet at 6:30 Thursday, July 6th, at the Truck World off Rt.62 and I80.

Share | 
 

 Annular vs Down Leg Carburetors

View previous topic View next topic Go down 
AuthorMessage
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Annular vs Down Leg Carburetors   April 20th 2012, 10:41 am

scratch What would be better down leg or annular booster for the following combination? 340: 13:1 compression trw pistons, 606 lift flat tappet cam, degreed w2 heads ported, 2.08 intake/1.60 exhuast, mopar performance w2 racing intake manifold, 8 bolt crank, heavy duty flat tappet rockers, lots of timing, AR53 race plugs, ect. Shift at 7200 rpm. Going to run a carb spacer also. either 1 or 2 inch 4 hole. Probaly get a fuel cool can and header extensions after we get running.
Back to top Go down
http://facebook.com
Blair

avatar

Join date : 2010-01-28
Location : FRANKLIN PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 20th 2012, 10:48 am

big block chevy
Back to top Go down
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 20th 2012, 12:29 pm

lol I'm afraid the chevy won't get the job done
Back to top Go down
http://facebook.com
amac
King of the Hill
King of the Hill
avatar

Join date : 2010-01-23
Location : fredonia

PostSubject: Re: Annular vs Down Leg Carburetors   April 21st 2012, 9:21 am

If you are going to buy a new carb from let,s say AED then tell them what you have and they will advise you on what carb would be best suited to you,re engines needs. If you are going to buy a used carb get whatever is cheapest in you,re cfm range[750-850 etc.] and you will have to tune it to you,re setup. Also I was reading you,re other post and 4.88 gears in the rear with 29.5 tires ain,t gonna get it in the quarter 4.11 with a 29.5 0r 30 inch tire will do you better if you want to spin the motor maybe 4.30
Back to top Go down
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 21st 2012, 1:13 pm

Tire measures 30.6 tall and shift point are 7200. What about a 4.57 gear?
Back to top Go down
http://facebook.com
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 21st 2012, 1:21 pm

6800 shift point would be consirvitive on the motor. Which we might do since will be out testing alot and bracket racing.
Back to top Go down
http://facebook.com
amac
King of the Hill
King of the Hill
avatar

Join date : 2010-01-23
Location : fredonia

PostSubject: Re: Annular vs Down Leg Carburetors   April 21st 2012, 9:26 pm

Brock if you are gonna run the eighth only then go low but if you are going to mix the eighth and quarter you better go higher . With a higher gear it will be lazy in the eighth but run through the quarter without zinging the motor.
Back to top Go down
Zuluzahn
Club Member
Club Member
avatar

Join date : 2010-09-10
Location : Leetonia, Ohio

PostSubject: Re: Annular vs Down Leg Carburetors   April 22nd 2012, 10:08 am

Brock, I run a 29.0" tall tire with 4.33 gears and cross the traps @ 7200rpm. Toot uses 28.0" tall with 4.10 gears and does about the same. Chances are unless your motor buzzes to 8000+ rpm every time without issue you'll never make a full 1/4 mile pass. After reading about your components a 7200 shift point seems a little high and you would never get into 3rd gear in the 1/8 unless you go with such a low gear. That's my nickel...

_________________
Peace Out! Tim
Back to top Go down
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 22nd 2012, 6:05 pm

Nope 7200 rpm is were the motor makes the power and with 5.13 gears we weren't shifting into 3rd gear untill 100ft from finish line. If that means anything.. We have a 3 speed 904 tranny and gears are way different in the tranny itself then your guys.
Back to top Go down
http://facebook.com
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 22nd 2012, 6:07 pm

That's in the 1/8 mile
Back to top Go down
http://facebook.com
Guest
Guest



PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 6:52 am

1. How do know the power output is 7200 ? Ever had the motor on a dyno ?

2. Get your transmission book out and read it. In 3rd or 4th gear the ratio is 1:1.

3. I thought you said your tach didn't work, so how do you know what your shift point was ?
Back to top Go down
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 10:03 am

1. tach worked at one time
2. 1st and 2nd gear ratio is different and its only a 3 speed.
3. Your right about a exact number on the dyno but the motor does make power to that rpm if not alittle more because the cam is good to 7200 and intake is good to either 7200 or 7300 plus we got the heads to back them up.
Back to top Go down
http://facebook.com
Little Toot
Club Member
Club Member
avatar

Join date : 2010-01-23
Location : East Liverpool, Ohio

PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 10:18 am

Just because your cam makes power to a certain RPM does not necessarily mean that the motor makes power to that RPM, it depends on your head and intake as well....

_________________
Little Z wrote:
This club is for those who like to go out and beat the every living shit outta their stuff on the track a few times a year. Some once, some once every other day. That's all
Back to top Go down
Guest
Guest



PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 10:21 am

First and second gear doesn't mean squat once you're in high gear.

A manufacturer of equipment will deal in generalities and not specifics and tell you their product is better than sliced bread. Each combination is different and the only way to find out what it'll run is to put that thing togther and race it and go from there. Folks on here are trying to guide you along but you seem to believe what you're reading on some of the Mopar message boards.
That motor is a big air pump and doesn't give a rats ass what it says on the valve cover.
Back to top Go down
Brock Spangler

avatar

Join date : 2010-09-26
Location : West Middlesex PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 3:17 pm

Ok back to gearing I just don't see how a 4.57 gear is to steep for the 1/4. On that one guys post with 29 tall tire and 4.33 gears how in the world are you going through the traps at 7200 rpm just seems alittle high.
Back to top Go down
http://facebook.com
Blair

avatar

Join date : 2010-01-28
Location : FRANKLIN PA

PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 3:46 pm

sounds to me like you have it all figured out.I don't know about you other guys but can't stand these kids nowadays asking experienced people questions and all they want to do is argue about it.I say do what you want, you'll just have a short racing season.
Back to top Go down
Zuluzahn
Club Member
Club Member
avatar

Join date : 2010-09-10
Location : Leetonia, Ohio

PostSubject: Re: Annular vs Down Leg Carburetors   April 23rd 2012, 6:02 pm

OK, I just ran some numbers and came up an rpm of 8563 with a 29.5" tire and 4.57 gears. This was figured with a conservative 15% converter slippage and this was only for a 130 mph pass. There are so many things that go into figuring these things out that it does get confusing. I am pasting a link for you that is nothing but racing calculators. This also where I got your rpm with your tire and a 4.57 gear. I just used 130 mph as a baseline speed.


https://www.hotrodpitstop.com/tool.php

_________________
Peace Out! Tim
Back to top Go down
Sponsored content




PostSubject: Re: Annular vs Down Leg Carburetors   

Back to top Go down
 
Annular vs Down Leg Carburetors
View previous topic View next topic Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Quarter Eights Drag Racing Club :: Lounge-
Jump to: