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Picking up where the original build left off;

The engine went into the car just as it came off George’s dyno in 2006, the only change being replacing the OEM oil pan with a STEF’S fabricated oil pan shown below:

pan1

pan2

pickup4

The pan swap was an attempt to resolve a pronounced oil control & windage issue that was exhibited by the factory oil pan over 5000 rpm on the dyno. Unfortunately the STEF’S pan did not resolve the issue, but more on that in a moment.

Once the car was completed, I drove it for a while on the street, but I began to notice quite a bit of oil smoke coming from the exhaust. In 2014 I decided to pull the engine and find out what the source of the issue was. As it turns out, the block had NOT been honed with a torque plate as I’d instructed during the first build, and this caused a clearance issue with the pistons which caused several of them to scuff the skirts. Obviously ring seal was history at this point as well, hence the smoke.

The block went to another local machine shop where everything was cleaned up, and the block was re-honed–WITH torque plates this time! A new set of custom AutoTec pistons were ordered with a slightly smaller dome volume to reduce the compression ratio down from 11.2-1 to 10.5-1 to allow for a bit larger & safer tuning window. The new pistons also featured a 1.5-1.5-3mm ring package as opposed to the original piston’s 1/16-1/16-3/16 package. I was long skeptical about running thin low tension rings on the street due to potential longevity issues, but ring technology has progressed by leaps & bounds since this engine was first built, hence the change.

The engine again went back together exactly as it was during the first build–no changes other than the pistons & rings, so there’s really no updated build pics to share.

Once the engine was back together, I made arrangements to dyno it again, this time at Kammer Racing. I put the engine back together as closely as I could to the original build so I could re-establish a new accurate baseline. There is one significant change we had to make from the first round of testing–the original series of tests utilized a pair of 3′ long collector extensions and a pair of Walker 3″ mufflers, which actually showed an increase in power over open exhaust. Unfortunately there isn’t room to run the same exhaust system on Kammers dyno, so all testing was performed with 18″ open collector extensions.

001

A couple of light pulls were made to make sure everything was happy, then we let her eat. Here’s the first power pull:

Pull 3

As you can see the numbers are very comparable, so I consider this a valid baseline comparison.

Pull #4 was a water/oil temp test. Pull #5 saw a swap from the 3418 carb to the 4781, but the pull was aborted due to the choke slipping closed during the pull.

Pull #6 with the 4781:

Pull 6

There was a significant increase in power at higher rpm with the 4781, but note the brake specific numbers between it and the 3418–the 3418 is going very rich up top. I’ll be recalibrating the 3418 further and re-testing it again somewhere down the road.

Pull #7 was an oil level test.

Pull #8 was a 2° bump in timing.

Pull #9 was a swap from the OEM points distributor to an MSD unit. The curves were similar and the total was the same.

Pull 9

Pull #10 was very surprising. The 3″ collectors were removed from the headers and 3 1/2″ collectors were installed. Both pairs of collectors were the same length, and both tests used respective 18″ collector extensions.

Pull 10

The 3 1/2″ collectors hurt power everywhere. I went back to a 3″ collector a little later on during testing, but the 3 1/2″ collectors remained for all subsequent dyno pulls for this round of testing.

Pull #11 was another water/oil temp test.

Pull #12 saw another drop in water/oil temps, and power went up again.

Pull 12

Pull #13 saw the 163 intake swapped for a heavily ported Holley Strip Dominator intake which was built for another (as yet not shown) engine project.

Pull 13

Single digit power increases–this just goes to show how good that factory 163 intake really is.

Pull #15 saw a lash change on the exhaust valves only.

Pull 15

Pull #17 was the addition of a 1″ open carb spacer.

Pull 17

Pull #18 saw the addition of a 14X3 air cleaner. I tried to install the OEM air cleaner but I forgot that the base won’t clear the secondary pump lever on a double pumper carb, so I had to use a “generic” aftermarket base.

Pull 18

Pull #19 was a spark plug test between non-projected tips and projected tips, both of the same heat range.

Pull 19

Pull #20 was the removal of the choke blade.

Pull 20

Pull #21 was another ignition timing change.

Pull 21

Pull #22 put the timing back where it was and saw a change from the 2X 3 1/2″ headers to a pair of 1 3/4 X 3″ headers to see if they would recover the low end torque that was lost when the collectors were changed. They didn’t.

007

Pull 22

Pull #23 was a swap to a pair of equal length race headers with 2 1/8″ primaries and 4″ collectors. Surprisingly these headers provided the best peak torque of the session.

008

Pull 23

Pull #24 went back to the 2″ headers and a change in intake valve lash.

Pull 24

Pull #25 was the final pull of this session and saw an intake lash change in the opposite direction.

Pull 25

At this point the engine was pulled off the dyno…but not for long.
As a side-note:

Below are the gains from the first pull of the first session in 2006 and the last pull of this session. The numbers in parenthesis are the current figures.

 

RPM_______CBT___________CBP_____________BSFC

3000_______522____________298______________.507

3500_______520(553 +33)____343(369 +26)______.491

4000_______504(574 +70)____384(437 +53)______.513

4500_______479(587 +108)___411(503 +92)______.532

5000_______459(567 +108)___438(540 +102)_____.541

5500_______428(531 +103)___449(556 +107)_____.564

6000_______414(504 +90)____474(575 +101)_____.580

 

108 lb.ft of torque and 107 HP gains mostly due to tuning. Let that sink in.

Getting back to that STEF’S pan…unfortunately the engine was still exhibiting the unmistakable signs of oil control issues during this round of testing. Knowing these issues were still present, I made the decision to use another oil pan which was on the same engine project that donated the Holley Strip Dominator intake. The new pan was a Milodon #31188 which featured a full length windage tray and a passenger side kick-out. I also replaced the M77HV oil pump with a standard M77 pump in the hopes of freeing up a few more hidden ponies.

I scheduled a 3rd dyno session the following week to re-test the oil pan swap. I also built a Holley 1000HP carburetor main body to test with using the 4781 850 as a base. I also changed the collectors back to 3″.

Pull # 26 was the first pull made after the oil pan & pump swap. Note that all the previous pulls were made at 300 rpm/second and dyno guy forgot to switch it from 600 rpm/second for this pull.

Pull 26

596 lb.ft and 601 HP. I was shocked at the gains! I was expecting maybe 10 HP at best.

Pull # 27 was after swapping the 4781 carb main body for the HP main body. Note that this was at 300 rpm/second:

Pull 27

Pull # 28 was a swap from the Holley Strip Dominator intake and 1″ open spacer back to the 163 intake with no spacer:

Pull 28

Pull # 29 was an oil and water temp test. As noted on the sheets, all testing had been done with water around 110° and oil around 140°. This pull we bumped the water up to 159° and the oil up to 170°.

Pull 29

Didn’t care for that at all.

For the 30th and final pull, I just happened to remember at the last minute that I’d neglected to re-set the intake lash back to spec after the 25th pull, which was the conclusion of that session. I had them set at .030″ and the card called for .024″, so the lash was tightened back up. The engine was cooled back down to 110°/140°.

Pull 30

Back to 614.5 HP and 601 lb.ft torque. The tighter lash gave up some mid-range while gaining very little on top (compared to pull # 28).

There is still more to be had, but I’m more than happy with the results at this point. Again, this is all with bone stock cylinder heads with nothing more than a good 3 angle valve job. A cylinder head upgrade is already in the works, but that will have to wait for a bit– perhaps next year. I’m confident 650+ HP is well within reach at this point.

Thanks for reading along.

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