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The internals
Garrett, Gary
Here are the specs
Mildly Ported head, I cleaned out the bowl area where it looks like squirrels been naughing at and increased the ports >2mm
Port Match Head to Int Mani and TB…(too bad it cant be matched up to smaller spica box runners)
Decked Head to pick up +.5 C/R on flatter top 10:1 motornics.(better shaped than the 10:4).
Weight Balanced Pistons (not dynamic) within 1 gram. The Motronics weighed a ton…no funds for nice forged ones.
Stock Shotpeened Rods. I ground off the excess flashing. Weight balanced within 1 gram
3 Angle Valve Seat cut with Big Valves (by Hanford in Wash St.)
Tapered Int Guides. (by Hanford).
Stock Ex Manifold opened up 2mm for anti-reversion step matching of the bigger port size.
13 yr old stock exhaust with rear CSC resonator
Bolt ons:
Larger ingram TBs,
Ingram 164hp spica pump
Delta 11.9 in 11 ex cams.
Quadraflow stacks,
recurved (willet) Marelli Plex dist.
Wish list:
Managflow 2 1/4” exhaust
Oil cooler,
Additional radiator core
Windage tray
Check out the F/A ratio at the dyno-day. Hence the huge holes in the power curve. The mixture wasn’t even close to the ideal 12:1-12.5:1 for max power. So much for the set up from my mechanic. Last week I spent some time resetting the Ref Gap to .019 dialed back the FSC a half a turn lean and Presto! By the seat of the pants the car ran great, picks up cleanly and smoothly at low RPMs and felt stronger at top end too (maybe another 5hp?) Pretty content, I was gonna leave the settings there until I get a wideband 02 sensor for further fine tuning. The very next time I ran it, the T/A broke and the FCS spun loose. There goes all the pump settings. LOL it is an Alfa after all. I’m building a dummy until funds become available for another T/A. Anyone out there have a used working T/A for sale @ a fair price?
My original intent was to build a dual porpose spica street motor. This is my 3rd mod spica motor. Once its set up, don’t touch it for 6 to 8 years except for changing the filters. In the past I’ve had cars with IDF’s DCNFs DCOEs and Dellortos. They don’t seem to stay in tune if the car sits inactive too long. I seem to be struggling with setting up this motor maybe because of the more aggressive cams? Hopefully I can get it iron out. What I do like with the spica box and stock ex manifold, the motor looks bone stock and period correct. Typically, I’m suspicious of the vendors power increase figures. However, this Ingram package may just do the 164hp it claims. Using assumed drivetrain loss of 15% @ 153 crank hp or 20% @ 160 c-hp. All this with the F/A way off and no headers as recommended. My last stock 69 1750 dynoed @ 75 whp. Any one interested building a spica motor should contact Wes or George Willet.
Things I would do differently:
Go with smaller Stock Ext Valve. Stocks are pretty big already plus cooling benefits from sodium filled valves (I get some low speed knocking) may help with the pinging flash point. It also has less valve head shroud area, which looks to be a problem with the nords heads. Being hollow stemmed, they are significantly lighter than the stainless big valves. Keep the bigger intake because of the better valve angle cut for better flow.
Going back one step to a Smaller 11 or 11.3 intake Cam. A street spica pump doesn’t like to rev past 7000 anyways. If a cooling fan soaks up power (some say 7hp) exponentially with revs how much parasitic loss would the spica be? Moving the powerband back down a little helps the pump as well as better low speed drivability. Too many people get caught up in peak numbers…look at Bruce Colby’s TS impressive low down power. It’s really a “square motor” with similar torque an HP figures. I bet it’s a much faster street motor than mine. The fat torque curve seems to be overshadowed by peak big numbers. Eric Storhak also runs a pretty quick 8L cam torquky spica motor with stock valves at the Michigan events.
Use Stock TB’s they match up better with the stock spica box than the bored out ones. I do have a couple standard TB laying around. Some day I may try them back to back. I would like to find some longer and larger velocity stacks and build a stock looking airbox around them.
I think Gary Williams had a great idea for having a section for dyno results to eliminate some of the guesswork of various mods. Personally, his website has been informative as well as inspiring for me. I would like to thank everyone in the past who shared there set up on the BB
Any comments or suggestion are most welcomed.
davbert
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Linear Mode
