www.the351cforum.com

ALL things related to the Ford 351C
It is currently Mon Jul 16, 2018 10:58 pm

All times are UTC - 5 hours




Post new topic Reply to topic  [ 23 posts ]  Go to page 1, 2, 3  Next
Author Message
 Post subject: 2018 new cam results
PostPosted: Mon Jul 09, 2018 11:20 am 
Offline
User avatar

Joined: Mon Oct 29, 2012 2:39 pm
Posts: 830
Addressed more to Brent but offered for info.

Got past the thrash to the dragster to the track finally and got 4 passes in on Friday, 6 more on Saturday. Results of new items - mixed. I had my converter guy loosen up the converter (9") as much as possible for that design. The result was much better 60' - like 0.15 better, so a lot. Car left better too, provided I didn't stage at 2000. Put the trans brake button back in the car and left at 2500 - 1.28 60' just about every time.

Ran a pass at 6400 shift - 5.66 @ 121. Next at 6800 - 5.62 @ 121. Next 6600 - 5.64 @ 121. Left it at 6600, on Saturday ran 5.646, 5.638 @ 121.xx in time trials. Got real happy 1st round and went 5.57 @ 119 HARD on the brakes with a 1.23 60', don't know. Then 5.58 @ 121, 5.60 @ 121.

So really the point - it's running 1 MPH faster this year than last. Putting the pencil to it, more or less 122 MPH @ 1640 lbs = about 455 HP at the rear tires. Last year with the old cam, maybe 430 RWHP. SO some improvement, but not as much as I'd expect maybe. Car runs clean, carb seems set right more or less, (VP 110 fuel) and it pulls hard all the way to the stripe. Will try methanol later, after I decide that the fuel system is tight and will stay that way. I think leaks with alcohol are way more dangerous than with gas. Vacuum pump is working - still leaking some air either under the valley plate or maybe distributor o-ring. Still pulls 5+ in/hg running which is way better than header evacs could do last year.

Opinions welcome - I was thinking we'd be in the 550 HP range, not thinking I'm losing 100 HP through a Powerglide.

_________________
Chris - Merkel, TX
http://raceabilene.com/kelly/hotrod
"Owner built, owner abused."


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Mon Jul 09, 2018 4:30 pm 
Offline

Joined: Mon Nov 05, 2012 3:54 pm
Posts: 31
Well....long time since I drag raced but......

Doubt as you do the 100 hp loss from the 'Glide unless....something ain't right.

Your mere 5 to 5+ inches of vac. is hurting your hp...this you know and it's free hp if you can seal up that leak.

How's your rpm at the line with the loosened convertor? Maybe experiment with a taller gear (yeah, not cheap unless....) to cut rpms at the line. A tire swap to increase/decrease line rpms?

More heresy here! Even with perfect patterns, add more air to effect a change in 0-60's and rollout at the top end?

Any top-end retard dialed into your ditzy? Drop 2-3 degrees at top rpms?

Just an old dragster guy here............


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Mon Jul 09, 2018 6:14 pm 
Offline

Joined: Mon Oct 29, 2012 1:52 pm
Posts: 458
You say you loosened up the converter as much as possible for that design which made it less efficient. Then while the engine is making more power the converter is also slipping more on the top end which is costing MPH/eating most of it up. My friend Wes has had problems with that on his twin engine car which really tests the converter. The converter was starting to go away and slip on the top end, 60ft looked good but MPH was off.


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 5:08 am 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2320
I'd have to go back through and find the old specs and then see what I sent you. I have a lot of cams ground and my memory ain't as sharp as it once was.

What was the combination again? And what were ET's last season?

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 9:44 am 
Offline
User avatar

Joined: Mon Oct 29, 2012 2:39 pm
Posts: 830
New cam - 258/268, .401/.401 107 LS, 107 ICL, Adjustment .020
Old - 248/254 .384/.388 108 LS, 108 ICL , Adjustment .016

393 CID, 11.8:1, AFD 4V heads, Funnelweb 4V, 750DP frankencarb. Crank trigger, 28 degrees. There is no high RPM retard - should not need any. Tires are 31" 15W tire, 7 PSI, 4:11 rear gear, stock PG gears (1.76 I think, like leaving on a C4 in 2nd LOL). Car weighs 1450 w/fuel less driver, 1660 with me in it.

Last season we had some issues that I think was more a too tight converter and a sucky carb. 1.4x 60', 5.8x ET @119/120. It was hard to get the thing to leave clean unless it was staged at 3000 or better. I took the 750DP frankencarb off the Falcon - proven performer - and used that. Shooters are 39/37 from being in the car so might be a hair fat. I'll mess with that after I get the right staging chip in it. It will stumble a hair trying to leave at 2000, leaves perfect at 2500. 60' very consistent 1.27/1.28. We had a decent baro this weekend, still ran 120/121 MPH even at 4600ish DA. Before you say "wow, that's a lot" that's pretty decent. Friday is was around 3800 which is great for us. Last race 3 weeks ago we were running DA 5600+, higher than Denver MSL. DA can move 1500~2000' during a summer race day, now you know why everyone want to run alcohol here. The Falcon can move .05 ET/ 1 MPH during a race, along with everyone else running gas. If we run "late", about 8 PM the surface transits and you'll pick up .02 real quick LOL.

This converter is still pretty "tight" -about 2200 I start pushing through the brakes. Can't stage accurately like that so I had to go to the trans brake. Do not have a finish line RPM yet, nor an estimate of flash - just went from running 7.6x @ 93 to 5.6x @ 121 so next TnT I will be able to watch better. Takes a few laps to adjust to the speed. Of course once we're racing, we ain't looking at the dashboard so it has to be on a Friday LOL. To get any more out of the converter we'd have to go to an 8". This one should flash in the 5000 range.

Vacuum - I don't see that much HP in the pump. At the least, it's 10x better than last year because the thin valley cover I had leaked real bad, so the header evacs were - IMO - useless. Had valve cover leaks, etc. I should be able to make it better - I have a rig to put 10 PSI in the motor to find leaks and a high-zoot military grade leak detector. Very hush-hush, need-to-know thing. The new valley cover is .125 aluminum with a brace. Made gaskets for the ends and glued it down good. I'm out of gasket material, will get more today. The end gaskets may be a little thin. Or, it may be coming around the dist. seal. Down track it's pulling about 7 in/hg, so not bad even with a small leak. If I get a better seal I'm not inclined to go over 10~12 in/hg anyway, so it's over 1/2 way there already.

_________________
Chris - Merkel, TX
http://raceabilene.com/kelly/hotrod
"Owner built, owner abused."


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 10:07 am 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2320
You need to be shifting it at 7500.

I'm pretty impressed that it picked up trap speed, short shifting.

What's the ET difference from old cam?

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 11:10 am 
Offline
User avatar

Joined: Mon Oct 29, 2012 2:39 pm
Posts: 830
Almost none if you figure the 60' is from the converter change. 1.4x/5.8x, 1.28/5.64. That's .2/.2 more or less linear improvement.

I tried 6800, it picked up a bit of ET but no MPH. 6400 - 5.66, 6800 - 5.62. Both 121 MPH. 7500 just seems a bit much in a stock block. I can try higher but really don't want to beat on it that much LOL. Have to look and see if I have limit chips that high. The shift selector goes well up there, like 8200.

_________________
Chris - Merkel, TX
http://raceabilene.com/kelly/hotrod
"Owner built, owner abused."


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 11:17 am 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2320
In your first post, it looked like it was picking up ET with each higher shift point.

I would consider a .2 ET change and a 1 mph trap speed change pretty significant in an 1/8th mile, especially while shifting way short.

Also, lots of places where a vacuum pump can lose seal. Be sure and silicone under the intake bolt heads of the bolts that go into thru holes into the lifter valley.

If the rings aren't low tension, you won't see a lot of benefit.

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 11:32 am 
Offline
User avatar

Joined: Mon Oct 29, 2012 2:39 pm
Posts: 830
All passes were 121-ish MPH. The ET did change with the shift point, about .02 per 200 RPM. When I ran it through at 6800 and got no more MPH, I just dialed it back 200 and called it good. I'll get some chips and next TnT will try 7200 and see where the MPH goes. If it doesn't respond, my thinking is why hammer on it. MPH stayed consistent through the weekend, only the ET went haywire but some other factor than power caused that. Since I don't have a data logger, no telling what that was about.

_________________
Chris - Merkel, TX
http://raceabilene.com/kelly/hotrod
"Owner built, owner abused."


Top
 Profile  
 
 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 12:06 pm 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2320
A couple tenths would be worth about 50 hp...

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 23 posts ]  Go to page 1, 2, 3  Next

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group