Old Alfa Racer Pics from So. West Div. - Page 4 - Alfa Romeo Bulletin Board & Forums
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post #46 of 476 (permalink) Old 08-02-2010, 07:47 PM
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Dad towed his Giulietta race car on a single-axle trailer behind a '65 Corsa for quite a while. We probably owned more Corvairs over the years than Alfas. And while Curtis didn't mention it above, he raced a couple of Corvair Yenko Stingers several years ago.

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'66 GTV racecar, '71 Spider racecar, '74 GTV street car, '71 GTV project
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post #47 of 476 (permalink) Old 08-02-2010, 09:52 PM
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Is that a cold air duct running up to the original crossover intake tube?

1966 Giulia Sprint GT Veloce - pretty much finished!
Bunch of bikes too.
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post #48 of 476 (permalink) Old 08-15-2010, 07:58 AM Thread Starter
Richard Jemison
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Induction

Yes it is. The original one used a top plate from the early Veloce 101`s part that had a short round aluminum intake. To match the 45 Weber intakes the airbox inlet holes to the carbs were enlarged and radiused to match the 51mm intakes on the 45 DCOEs. With such box no length is added to the runner system as is the problem with Air Horns, and you get cold air, plus the charge from pulse containment.
See similar I have pics of below. Later Euro airbox is more efficient, but for period look the modification works fine using the 105 parts:
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RJR Racing

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post #49 of 476 (permalink) Old 05-20-2011, 08:00 PM
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Great time warp photos Richard..

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post #50 of 476 (permalink) Old 05-30-2011, 06:58 PM Thread Starter
Richard Jemison
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Duetto Back Home!

As most have probably read, I bought the car on Thursday and drove to Denver to bring it back!

Car is in mint condition, actually better than race cars should be!
It came with all new suspension and brakes, 8 new rims and tires (4 Hoosier R6s and 4 goodyear rains) fiberglas and steel hood & deck lids. Immaculately prepared and kept.

Found the remains of my original steel airdam where it was welded under the chin, and where the original roll bar was braced. They actually still had the aircraft oil cooler and lines I installed, boxed up at home. Amazing after 38 years of separation to have it back again!

Pics are below, as taken over the weekend..
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RJR Racing

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post #51 of 476 (permalink) Old 05-30-2011, 07:09 PM
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Kinda fun, isn't it?
Best, G.


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post #52 of 476 (permalink) Old 05-31-2011, 06:35 PM Thread Starter
Richard Jemison
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Engine

The engine was built by Mike Besic in April 1994, 17 years ago. I pulled the head just to see what condition it was in. The receipts listed all the components, and I knew the cams were way old school, but wanted to see how it looked internally. I knew it had never been raced with this engine, but I was surprised to find that there was insufficient run time to even seat the rings. Pistons had no build up, and wiped clean easily with a cloth....(see pics)
I pulled the intake valves and found all was in good order, but the large valves were too big for the seats so I reduced the OD down to 1.660 (1mm oversize rather than 2), reshaped the margins (rounded), swirl polished the backs, and put them back in the head.
I installed a pair of RJR 136 intake and RJR796 exhaust cams, and tomorrow will reasemble the motor.
Dropped off the GTA headers to be ceramic coated inside and out. Using the Titanium color ceramic on the outside.
I am going to modify a Euro 2 liter airbox to fit the 45 DCOEs to eliminate the air horns, and supply cold air from infront of the radiator.(similar the one in post 48 below, but 115 type, not 105 parts)

1st head with original cams
2-4th head redone
5th -pistons/liners
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RJR Racing

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Last edited by Alfar7; 06-02-2017 at 03:50 PM.
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post #53 of 476 (permalink) Old 05-31-2011, 06:44 PM
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Quote:
Originally Posted by Alfar7 View Post
I installed a pair of RJR 136 intake and RJR796 exhaust cams, and tomprrow will reasemble the motor.
Am curious about your cam selection? Want to share your thoughts.?
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post #54 of 476 (permalink) Old 05-31-2011, 07:22 PM Thread Starter
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Cams

Quote:
Am curious about your cam selection? Want to share your thoughts.?
The cams in the engine were Shankle 5414 int and 4316 exhaust.
Lifts were .492 and .420. with way too much overlap and duration for a little motor (272 @ .050)
Even though the motor is 1mm overbore with 14 to 1 CR ratio(head is cut .070), the cams I put in eliminate about 20 degrees of overlap and have will valve events(opening & closing timing) that will increase the combustion stroke length and increase nominal pressure. IE make Torque and HP at lower RPM.

The smaller valve/port although sustantially larger than stock, just doesn`t need as much cam, either lift or duration as a performance 2 liter. Too much cam makes for a hard engine to drive. I expect a much easier idling and drivable car with more torque and HP than could ever be gotten with the old design cams.

The intake is the same one that is used in most of the race motors, but as Ed Prytherch has pointed out is very torquey set up correctly. I used the 796 as an exhaust cams because of its early profile to time opening and closing events. It has a bit more lift than the old cam, but way less early duration (13 degrees less at .010 and 15 degrees less at .050), but nearly equal in duration above .200 lift. Too much exhaust cam just bleeds off power as opening and closing events are all wrong. That`s why you can`t use the same cam design on both intake and exhaust. I used these because they were on the shelf. I would have chosen the RJR487+3(6) and RJR776 as an exhaust, but I wasn`t going to wait 10 days to put it back together. The 487 is a 12.1mm version of the 550 which is a 12.7mm lift cam(your intake)

Your motor is proof that correct cams make a different engine!

Richard Jemison
RJR Racing

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Last edited by Alfar7; 07-14-2011 at 03:57 PM.
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post #55 of 476 (permalink) Old 05-31-2011, 08:07 PM
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Quote:
Originally Posted by Alfar7 View Post
Your motor is proof that correct cams make a different engine!
There's an understatement.

Thanks for the explanation.

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post #56 of 476 (permalink) Old 06-04-2011, 04:37 PM Thread Starter
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Mods to racecar

In order to improve the induction system, which entailed loosing the airhorns, as they make the intake track way too long. The intake system`s length is a holdover from the early mouse motors to enhance low and mid RPM torque which they had little of. Airhorns only compound the problem. Plus they are sucking in hot air.
I moved the radiator to the left 3 inches and built a intake box in the nose to trap air at speed, and pressurize the cold air coming into the plenum.
The cold air box (plenum) is a Euro air filter box gutted, with a 3' air hose to the collector box. I modified the carbs inlet by porting the first 10mm into a smooth flare, then boring the aluminum plenum intakes from 40mm to 52mm flaring them internally to provide smooth airflow into the caburettors. (miniture air horns?
The top cover of the airbox was dropped off to be power coated black wrinkle finish to match the cam cover.
Pics of the process are attached.
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RJR Racing

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post #57 of 476 (permalink) Old 06-11-2011, 07:38 PM Thread Starter
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Airbox finished

Pics of finished intake system.
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Richard Jemison
RJR Racing

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post #58 of 476 (permalink) Old 06-11-2011, 07:50 PM
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Very neat. I also like the transparent headers. Where did you find those? Really tidies up the engine compartment!


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post #59 of 476 (permalink) Old 06-11-2011, 10:02 PM
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Must be tricky to do the ceramic coating.


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post #60 of 476 (permalink) Old 06-12-2011, 07:22 AM Thread Starter
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Headers

Quote:
Very neat. I also like the transparent headers. Where did you find those? Really tidies up the engine compartment!
Yep, I had them blasted and then I painted them with clear paint.
.

Titanium headers should be finished by Tuesday or Wednesday.

Richard Jemison
RJR Racing

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Last edited by Alfar7; 06-12-2011 at 09:04 AM.
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