Spider improvement effort - Page 4 - Alfa Romeo Bulletin Board & Forums
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post #46 of 416 (permalink) Old 02-28-2009, 08:09 AM Thread Starter
Richard Jemison
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Weight / Stiffeners

I`ve told Nic the already light roll bar to brace the car was deleted and it was only 1.5 x .090 4130 mostly for looks.
The springs are staying soft, even though the suspension is getting wide and tricked with my race parts and illegal (for racing) widening parts, the chassis is getting some welded in bracing as I dont want flex at the cowl. The add on aftermarket bolt on stuff only adds weight and mental comfort They all flex a bit unless you add a cage, and thats not happening at this point.
I say that becaust I know how I am
See my post on the Alfetta GTV6 area on the before it became a GT2 car
My target weight is no more than 2300 pounds wet. Thats with oil & gas, not in the rain

Richard Jemison
RJR Racing

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Last edited by Alfar7; 04-22-2009 at 07:59 AM.
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post #47 of 416 (permalink) Old 04-22-2009, 07:07 AM
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hood vent question

Nice project, very unique! I have a question about the hood venting. You punched (is that the right term?) your vents "upside down" to act as air extractors, correct? Does this indicate there is normally positive pressure under the hood and/or negative pressure above the hood? Would you please post a few detail pictures of the top and bottom of the hood, I'd like to see how you worked around or replaced the hood braces. Thx!

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1969 1750 Spider
1971 1750 GTV
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post #48 of 416 (permalink) Old 04-22-2009, 10:15 AM Thread Starter
Richard Jemison
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Bracing

I removed the underhood cross bracing to have free access to stamp the louvers.
Once the engine position, rearward, and clearance for hood bracing is evident new bracing can be formed and put in place.
The next trip over to Nic`s I`ll take more pics and update the thread.
I`ve been reading George`s thread on his V6 Spider at:
http://www.alfabb.com/bb/forums/engi...-makeover.html
Had me thinking of stuffing one of my V612V 3 liters in it except for the weight and trans issues...
Always something.
I should finish the GTR

Richard Jemison
RJR Racing

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Last edited by Alfar7; 04-26-2009 at 03:39 PM.
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post #49 of 416 (permalink) Old 04-23-2009, 12:45 PM
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Hi, great project, its going to look fantastic.

I'm after some 5 spoke wheels like the one on the front driver side of your car. Can you tell me what they are and where they are from?

Thanks

Anglo
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post #50 of 416 (permalink) Old 04-26-2009, 04:04 PM Thread Starter
Richard Jemison
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Short update

Maybe there will be more progress, as I was very disapointed in lack of work done since last visit in Febuary. My fault. Will start weekly prayer meetings!!

Wheels, If I remember correctly they are made by ECR or ECP and are 15 X 7.5 with 5.3/4 back spacing. More than normal but perfect for the extra .5 inch per side widened chassis front suspension on the spider. On the back they will just have to be spaced out.

About the hood I took it out & took pics of it again. The color is from the bare metal being acid preped. It is not painted, only preserved. As you see there is no bracing. Room for either V6 FI or carbed, or the 4 cyl intakes, modified FI or whatever Weber intake I use.

The front of the roof is completely welded to the windshield and the rear is being shaped into the body.
A second metal roof pannel will be welded into the windshield and roof as any typical hardtop would have for structure.
Time consuming when it`s not getting priority!! Now it will......
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RJR Racing

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post #51 of 416 (permalink) Old 04-26-2009, 04:17 PM
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the nose looks like a mako shark

anyone can buy a Porsche, only Drivers drive a Alfa Romeo
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post #52 of 416 (permalink) Old 05-08-2009, 04:03 PM
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The Ghia roof looks surprisingly good on that body. Imagine how well it might work with the Duetto with the sloped rear deck and the trunk lip curve matching the sill of the rear window.

Will that thin roof add enough structure to stiffen the chassis? It's got to be much better than without! And the missing weight everywhere will help in the momentum dept.

That roof appears to be a popular idea...
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post #53 of 416 (permalink) Old 05-08-2009, 05:28 PM Thread Starter
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Sheesh....

Not even a good cut & paste

Richard Jemison
RJR Racing

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post #54 of 416 (permalink) Old 10-03-2009, 12:09 PM Thread Starter
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Coupe`s Progressing to Montreal Power!

I found a complete FI Montreal for sale in Vancouver BC, for an exorbitant amount, and decided that it would be a suitable source of power for the "Lightweight Coupe".

It cleared US Customs after a two day hold up wednesday and should be here Tuesday or Wednesday next week.

Heres some pics:
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Richard Jemison
RJR Racing

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post #55 of 416 (permalink) Old 10-03-2009, 12:37 PM
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you could do this, buy an audi tt or a porshe 914 , and have an easyer time on this

anyone can buy a Porsche, only Drivers drive a Alfa Romeo
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post #56 of 416 (permalink) Old 10-03-2009, 04:53 PM Thread Starter
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And then what would I have?

Quote:
you could do this, buy an audi tt or a porshe 914 , and have an easyer time on this
__________________
And then what would I have? A VW by another name? and I wouldn`t want my dog to pee on an audi

If I wanted a car I would buy a Cayman "S".

Richard Jemison
RJR Racing

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Last edited by Alfar7; 10-03-2009 at 05:21 PM.
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post #57 of 416 (permalink) Old 10-03-2009, 04:57 PM
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those 2 photos, one looked like a tt, and a classic 914

anyone can buy a Porsche, only Drivers drive a Alfa Romeo
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post #58 of 416 (permalink) Old 10-03-2009, 09:40 PM
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Bianchi: Take a look at who posted those pictures then ask yourself if your last two posts make any sense.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #59 of 416 (permalink) Old 01-05-2010, 08:24 AM Thread Starter
Richard Jemison
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Montreal Head & valve shaping

Since the Montreal engine going into the "coupe" is being developed for improved low end torque and drivability and generally only a moderate increase in output, I decided to get the headwork done as I had a buyer for my SuperFlow flow bench and I wanted to measure some of the results before it was picked up.

The intake and exhaust cams I built for the motor are typical RJR designs with less overlap but more open valve duration. Lift (at valve) increases of 1.25mm on intake and 1.32mm exhaust.

Since the motor is a low milage piece and not being preped for "High Output", I decided to concentrate on the bowl, seats and valve shapes to get maximum flow from the typically congested Alfa seat/valve area.

The guides were like new and I decided to work around them, which was not a problem as the ports are adequate in size for the combustion chamber volumn. Cleaning up and reshaping the bowls, and throats into the ports was simple once the valve seats were opened.

The seats were typical Alfa parallel sleeve sections that are the same OD as the valves. They had enough seating area that significant opening could be done and adequate seating width be left to seat the reshaped valves at the outer margin and pick up 2mm intake diameter and 3mm exhaust diameter at the seat.

The seats were cut away with a 75 degree cutter then a 45 degree stone was used only to break the edge left at the 30 degree seats. No 45 degree cut was made as the seats were opened maximum for flow to the seat area, and the valve seat area left as small as reasonable for a street motor.
( For those of you that think "3 angle" valve cuts are best you are way behind. You do NOT attempt to manage flow at such small radiuses and high speeds with "shapes"! Larger valves applied to such seats only add additional interference to fluid flow (air). )

The valves (stock) were re-shaped on the back side & margins to a shape I have used for years. Seats (30 degree) were left at the outer 1mm of the valves cutting away the "lip" between the flare & seat area. Margins rounded from seat to face on intake & exhaust.

The flow at .200 lift (50% of total valve lift) improved over 20% above the stock seat/valve flow rate. I did not have time to measure higher lifts but the significant measurement was more than I expected, and was likely a result of smaller valves/seats than normally played with.

I added O2 sensor bungs to the headers for fuel mixture calibration, and had them Ceramic coated with a satin finish locally.

Pics below of before & after.
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Richard Jemison
RJR Racing

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Last edited by Alfar7; 05-11-2010 at 06:29 PM.
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post #60 of 416 (permalink) Old 01-05-2010, 08:42 AM
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Hmm, Alfa porn...
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- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina


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