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My BBC progress

General engine tech -- Drag Racing to Circle Track

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prairiehotrodder
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My BBC progress

Post by prairiehotrodder » Sat Feb 09, 2019 1:33 pm

I just am so happy that speedtalk is back. I want to post an update on my build a progress and my plans for the next season.

My motor was a pump gas 540 with AFR 335 heads and a tunnel ram in an 81 malibu

I went 9.72 at around 137 last summer best.

This winter my motor came apart for major changes :
bore 4.560 with mahle pistons and skinny rings
new cam Erson custom 280 / 288 @ .050 .730 / .760 lift 112 LSA in the motor at 108 ICL
new trend heavier wall pushrods
Moroso power pan with side kickout for oil control
mild smoothing of runner entrances in tunnel ram plenum
CR changed to 12.9 planning to use 100 octane AV GAS.

I just got the motor running again 2 days ago but racing season doesn't start until mid may.
The Word of God is quick and powerfull
www.therocketshop.blogspot.com

steve cowan
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Re: My BBC progress

Post by steve cowan » Sat Feb 09, 2019 3:46 pm

Hi Brian,
i have been following your car for last couple of years,shes a bad beast
good luck this year,what are your thoughts 9.50s @ 140mph ??
i would be interested to find out if your compression and cam changes will move peak rpm and shift points compared to previous setup all else being equal,rear gear,converter etc.
steve c

prairiehotrodder
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Re: My BBC progress

Post by prairiehotrodder » Sat Feb 09, 2019 4:11 pm

Thanks Steve, whats the weather like down under ? This week has been the coldest i've seen in a long time. Its been - 38 C every morning.

According to my friend "old school" who has coached me through this build, I should gain around 80 hp at least from my changes. It should hold the power longer after peak power which should make my car faster. And if i can hook it there should be more torque off the starting line. I'm hoping for low 9's. Maybe will make around 800 - 850 hp. I liked to dream the old motor was making 800 hp but i think in reality it was more like 700.

A couple changes i might have made if i had the money was to go to the next step AFR heads which were the 357 CNC heads and maybe try the newer design Edelbrock #7085 tunnel ram. However its back together now and i already spent way more than i should have. Tubbing the car might also soon become necessary but i really don't want to go there.
Brian
The Word of God is quick and powerfull
www.therocketshop.blogspot.com

steve cowan
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Re: My BBC progress

Post by steve cowan » Sat Feb 09, 2019 5:15 pm

Brian,
we are the other end of temperature over the last couple of months + 35-+40 deg C
plus a lot of humidity,February is a pain.
Our street car bracket series started last weekend it was still 36.4 deg C at 5pm.
thanks for the follow up information,sounds like you have a well thought out plan and cant wait to see the ETs tumble,best of luck
steve c

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Re: My BBC progress

Post by prairiehotrodder » Tue May 07, 2019 11:23 am

to bring my thread back to life. I drove the car yesterday to town and back. The power is definitely way up from last season. It feels like a dragster now when it does burnouts on the street. I'm thinking since traction was marginal last season, it may be impossible this season. I'm hoping to get to the track sometime soon but don't know when. I will post the results as they happen.
I'm looking forward to a new season of racing. Av-gas has actually came down in price. Got new slicks on 29.5 x 10.5 x 15 ET drags. Also have new front upper control arms from global west "drag race" arms that have +5 more caster built in. I'm afraid this is going to be a season of trying to tune the suspension and not the motor. We shall see.
Brian
The Word of God is quick and powerfull
www.therocketshop.blogspot.com

prairiehotrodder
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Re: My BBC progress

Post by prairiehotrodder » Sat Jun 08, 2019 10:02 pm

Well i can finally give an update on my progress. On friday night with marginal traction i went 9.39 at 141.8 and 9.4 at 142. The av gas is working awesome with 12.9 CR.

Today i did a massive wheelstand, and crunched my headers and a bent moroso solid motor mount on the passenger side. Went 9.8 at 137 on the half aborted wheelstand run.

Time to figure out how to make a g-body not do that.

Brian
The Word of God is quick and powerfull
www.therocketshop.blogspot.com

stealth
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Re: My BBC progress

Post by stealth » Sat Jun 08, 2019 10:53 pm

What were the cam specs you changed from?
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.

prairiehotrodder
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Re: My BBC progress

Post by prairiehotrodder » Sat Jun 08, 2019 11:04 pm

lunati 274 / 283 .704 / .744 110
The Word of God is quick and powerfull
www.therocketshop.blogspot.com

steve cowan
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Re: My BBC progress

Post by steve cowan » Sun Jun 09, 2019 3:34 am

Hi Brian,
I am sorry to hear about the damage, I hope it is not to bad.
But on a positive note you picked up et and mph so you are making some steam.
On the slide rule your et and mph are extremely close,
I don't know the weight of your car but
3400 pounds shows 760-770 hp.
I like how you are using Avgas defiantly saving a couple dollars there.
A drum of say MS 103 or C16 as an example here in Australia ranges from $240-280 a drum 20 ltrs -5 gallons.
Can't wait to see how the Malibu goes less big wheelstands and can get some good air :D
steve c

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Re: My BBC progress

Post by F-BIRD'88 » Sun Jun 09, 2019 8:35 am

Time for wheelie bars.

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Re: My BBC progress

Post by GRTfast » Sun Jun 09, 2019 9:28 am

prairiehotrodder wrote:
Sat Jun 08, 2019 10:02 pm
Well i can finally give an update on my progress. On friday night with marginal traction i went 9.39 at 141.8 and 9.4 at 142. The av gas is working awesome with 12.9 CR.

Today i did a massive wheelstand, and crunched my headers and a bent moroso solid motor mount on the passenger side. Went 9.8 at 137 on the half aborted wheelstand run.

Time to figure out how to make a g-body not do that.

Brian
That must have been a wild ride! Glad you’re ok.

F-BIRD'88
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Re: My BBC progress

Post by F-BIRD'88 » Sun Jun 09, 2019 9:30 am

Are you using a transbrake?

Coloradoracer
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Re: My BBC progress

Post by Coloradoracer » Sun Jun 09, 2019 9:50 am

F-BIRD'88 wrote:
Sun Jun 09, 2019 8:35 am
Time for wheelie bars.
yep......
Mark Goulette
Owner/Driver of the Livin' The Dream rear engine dragster
Speed kills but it's better than going slow!
http://www.livinthedreamracing.com
Authorized Amsoil Retailer

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Re: My BBC progress

Post by Newold1 » Sun Jun 09, 2019 10:39 am

Sounds like a case now of serious chassis correction! Power can be a frustrating thing when it comes time to transfer it to the track. You'll figure it out.

Nice job so far, best of luck on the balance.
The Older I Get, The Dumber I Get :wink:

prairiehotrodder
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Re: My BBC progress

Post by prairiehotrodder » Sun Jun 09, 2019 3:52 pm

yes i'm using a transbrake. The 2 step was set at 3000 rpm. Convertor is an ATI 5200 8 inch.

I think i'm gonna get rid of the solid motor mounts and go to poly so there is a little bit of give. I'm lucky i didn't break the block.
IMG_2700.JPG
As far as suspension i'm thinking of putting stock shocks back on the front and removing the 90/10 's . Also i could lower the back of the rear lower control arms which i think would move my IC forward ?

Brian
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The Word of God is quick and powerfull
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