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Why is engine tech so dead?  

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SuperStockAMX
(@superstockamx)
Noble Member

Finally got the cam degree’d in yesterday, set cam endplay. Now I need to check P/V clearance with race springs installed. In the “if it don’t go, chrome it!” category, I had the oil pan, timing cover and headers polished . Not usually my style but man, do they look putty!
Yep, still slow as a tortoise around here!

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite

1320/MPH=optimum ET!

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite
1320/MPH=optimum ET!

ReplyQuote
Posted : 03/02/2019 1:33 pm
SuperStockAMX
(@superstockamx)
Noble Member

Finally got P/V clearances checked. With calculation for new head gaskets (still waiting on those) with lash figured, I have .106” exhaust and .116” Intake. The exhaust is a number I am happy with but the intake pocket needs to get shallower. Maybe next time.

Sent the oil pan back to it’s maker on Friday. I had checked the alignment on bolt holes previously...all was good..but I never checked the oil pan with the timing cover on and for reasons I can not figure out, other than a build screw up, the front pair of bolt holes and the front lip of the pan are about 3/8” short of where they need to be. Forget the bolt hole alignment, the oil pan lip will not seal against the timing cover seal! And as I pondered what I did wrong, like maybe a problem with the front and rear billet main caps(?), I threw on two different oil pans I had laying around; a Charlies and a home built race pan. Both fit perfectly which confirmed the issue was in the pan. So Doug told me to send him the pan along with the Charlies Oil Pan. I also sent along a new set of billet main caps for him to use in fitting. Knowing Doug, he will have this fixed and back to me soon, maybe even before I get my head gaskets.

At this point, just waiting on pan and gaskets and then only a matter of bolting it together.

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite

1320/MPH=optimum ET!

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite
1320/MPH=optimum ET!

ReplyQuote
Posted : 10/02/2019 6:06 pm
sc68z28
(@sc68z28)
Honorable Member

quote:


Originally posted by SuperStockAMX

...dyno’d around 620 HP and ran a best of 10.02 @ 133.0


Hey Jeff, at what race weight did you run that ET/MPH?

Reason I ask is mine runs those same numbers (depending on DA) and mine only dynoed 555hp @6900 / 475tq @5300. I did change a few things after the dyno that was done with a carburetor, I added shaft rockers (same ratio) and a vacuum pump. I don't see those changes and my EFI making 65 more hp, but have always thought the 555 was a soft/conservative number.

As I remember our cars are similar race weight? I'm 3220#s.

Every online ET/weight/HP calculator I have used says you need well over 600 hp to run 10.0s / 132 @3200#s. Your numbers would confirm that.

---Bill.

68 Camaro, blown 380, 7" 2 disc Advanced clutch, GF5R.
Best ET 8.65 @160, w/13 lbs boost.
N/A 9.96 @133
60' 1.28 vid http://www.youtube.com/watch?v=1OLzx5jBo4w

68 Camaro, blown 380, 7" 2 disc Advanced clutch, GF5R. [IMG">http://i12.photobucket.com/albums/a224/sc68z28/stickwillie.jpg[/IMG">
Best ET 8.65 @160, w/13 lbs boost.
N/A 9.96 @133
60' 1.28 vid http://www.youtube.com/watch?v=1OLzx5jBo4w

ReplyQuote
Posted : 26/02/2019 3:11 pm
SuperStockAMX
(@superstockamx)
Noble Member

The SS/H minimum would have been 3,160#...that’s with driver. 9.5 x 315 HP + 170 = 3,162.5# and NHRA allows you to round it down.
I typically ran the car around 25# or so heavy.

My last D/S (Stock Class) engine was 555 HP with the Holley carb & an aluminum dual plane Edelbrock R4B intake. Same weight; 3,160#. That ran a best of 10.46 before I lost all the bearings as previously outlined.

Both examples were in Arizona and I don’t recall that the DA or BP was anything to brag about.

Update: Oil pan arrived the other day. Head gaskets are supposed to be shipped already.

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite

1320/MPH=optimum ET!

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite
1320/MPH=optimum ET!

ReplyQuote
Posted : 27/02/2019 7:15 pm
SuperStockAMX
(@superstockamx)
Noble Member

OMG after 90 days I finally received head gaskets! Would like to find some time this weekend to finish or at least a big chunk of knocking out the engine.
Found out my block plate is 2-weeks from done.

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite

1320/MPH=optimum ET!

NHRA SS/H
1970 390 AMC AMX
Advanced Clutches
Single 8” Billet
4300 Autolite
1320/MPH=optimum ET!

ReplyQuote
Posted : 19/03/2019 9:45 pm
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