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Billet drum comparison #1527361 11/02/13 11:17 AM 11/02/13 11:17 AM
Joined: Dec 2012 Posts: 1,824 Wind Gap,Pa. S Sammy OP top fuel
Sammy OP top fuel S Joined: Dec 2012 Posts: 1,824 Wind Gap,Pa.	I lost a solid .1 from switching from a billet steel A & A drum to a billet aluminum drum Can this really happen? No other changes were made and the 727 torqueflite is fresh

Re: Billet drum comparison [Re: Sammy] #1527362 11/02/13 02:03 PM 11/02/13 02:03 PM
Joined: Jan 2003 Posts: 11,718 Portage,michigan B B3422W5 I Live Here
B3422W5 I Live Here B Joined: Jan 2003 Posts: 11,718 Portage,michigan	I went from a stock hipo rebuild type 727 to a full roller with aluminum drum and saw nothing. Others have said they didn't see anything either with such changes. 69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8

Re: Billet drum comparison [Re: B3422W5] #1527363 11/02/13 02:09 PM 11/02/13 02:09 PM
Joined: Nov 2003 Posts: 1,969 Chandler, AZ Duner top fuel
Duner top fuel Joined: Nov 2003 Posts: 1,969 Chandler, AZ	I desperately want to see the difference between a 46RE and a rollerized 727.... I've heard it's as much as 4 full tenths.

Re: Billet drum comparison [Re: Sammy] #1527364 11/02/13 03:54 PM 11/02/13 03:54 PM
Joined: Oct 2006 Posts: 596 Mass. 8 80fbody mopar
80fbody mopar 8 Joined: Oct 2006 Posts: 596 Mass.	Only built one myself but I wonder if clutch/band materials &/or clearances could have caused the trans to be a little tight? Or maybe the line pressure is off from where it was? Just a little brainstorming.

Re: Billet drum comparison [Re: 80fbody] #1527365 11/02/13 04:18 PM 11/02/13 04:18 PM
Joined: Aug 2003 Posts: 1,575 K KOS pro stock
KOS pro stock K Joined: Aug 2003 Posts: 1,575	just did the exact same switch and lost 2tenths 2mph........i was wondering the exact same thing.....the alum drum is 6lbs lighter than the billet steel one how in hell can the car slow down???the car 60ft is down .5 and i just did a converter change to rule out the vert will find out tm im tryin to get back out weather permitting.

Re: Billet drum comparison [Re: KOS] #1527366 11/02/13 04:48 PM 11/02/13 04:48 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster master
dizuster master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	Band too tight dragging on the drum? I know we switched from an aluminum to a billet in my Dad's NSS car this summer, and the car slowed down ~.08 from the change. Aluminum drum should most definitely help, not hurt.

Re: Billet drum comparison [Re: Sammy] #1527367 11/02/13 05:16 PM 11/02/13 05:16 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: I lost a solid .1 from switching from a billet steel A & A drum to a billet aluminum drum Can this really happen? No other changes were made and the 727 torqueflite is fresh unless you did the swap on the same day same conditions it would be hard to compare.

Re: Billet drum comparison [Re: Quicktree] #1527368 11/02/13 05:48 PM 11/02/13 05:48 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	Quote: Quote: I lost a solid .1 from switching from a billet steel A & A drum to a billet aluminum drum Can this really happen? No other changes were made and the 727 torqueflite is fresh unless you did the swap on the same day same conditions it would be hard to compare. a drop of 10 on the barometer for me is almost a drop.08 of e.t. on the same tune.

Re: Billet drum comparison [Re: Sammy] #1527369 11/02/13 06:20 PM 11/02/13 06:20 PM
Joined: Oct 2011 Posts: 3,036 bean town ....Ca W WHITEDART master
WHITEDART master W Joined: Oct 2011 Posts: 3,036 bean town ....Ca	I will lose .1 on a rebuild.. starts coming back after 8 or 10 runs if the trans is working fine just run it In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb

Re: Billet drum comparison [Re: WHITEDART] #1527370 11/02/13 06:25 PM 11/02/13 06:25 PM
Joined: Mar 2006 Posts: 9,847 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,847 MI, usa	Barring nothing else changed anywhere. The only thing I could possibly think of is loss of coefficient of friction between the K/D band and the drum. A lighter part should never slow the car down. We'll see I have plenty of data with my 10.2 lb A&A steel drum. I'm changing back to aluminum for next year. Doug

Re: Billet drum comparison [Re: Quicktree] #1527371 11/02/13 07:02 PM 11/02/13 07:02 PM
Joined: Dec 2012 Posts: 1,824 Wind Gap,Pa. S Sammy OP top fuel
Sammy OP top fuel S Joined: Dec 2012 Posts: 1,824 Wind Gap,Pa.	Quote: Quote: I lost a solid .1 from switching from a billet steel A & A drum to a billet aluminum drum Can this really happen? No other changes were made and the 727 torqueflite is fresh unless you did the swap on the same day same conditions it would be hard to compare. This is over the course of the whole racing season. Just never 60 footed where it was and to the 1/8th off by .05 and 2 mph and a full tenth at the big end. Was hoping for a new best with the good air only to come up short.

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