Firewall Project

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pro70z28
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Firewall Project

#1 Post by pro70z28 » Fri Oct 23, 2009 11:00 pm

I'm ready to rebuild the firewall. I cut the flanges out today for the intercooler tubes to pass through the firewall. I'll turn them down on the lathe & weld them in place & shape the sheet metal around them.

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pro70z28
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Re: Firewall Project

#2 Post by pro70z28 » Sun Oct 25, 2009 8:25 pm

Got the flanges turned this weekend.

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I put a groove around the edge of the flange for the firewall sheet metal. Once I install the o-ring and get in place I'll check the new gap with a feeler gauge and make a soft gasket to seal the flange to the firewall

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Engine side of the flange bored to size for the tubes.

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Got everything mocked up. The flanges on the windshield will be added to the inlet side. I'll turn those once I get the V-band clamp. Should be here any day. The outlet side attaches to the carb bonnet with hose & clamp.

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mytmouz
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Re: Firewall Project

#3 Post by mytmouz » Sun Oct 25, 2009 9:32 pm

:thumb:
Trucks are for haulin...

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pro70z28
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Re: Firewall Project

#4 Post by pro70z28 » Tue Oct 27, 2009 9:50 pm

Made a little more progress. I put the ol' foam mock up engine in it to make sure I get the angles right before going too much further.

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mytmouz
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Re: Firewall Project

#5 Post by mytmouz » Tue Oct 27, 2009 10:51 pm

What's the mileage with that carb?
Trucks are for haulin...

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pro70z28
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Re: Firewall Project

#6 Post by pro70z28 » Tue Oct 27, 2009 11:08 pm

Very good. I've had it for a couple years now and have yet to use a drop. :smt003
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wikd69
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Re: Firewall Project

#7 Post by wikd69 » Tue Oct 27, 2009 11:30 pm

That made me laugh !!! :smt003

Have you considered doing an injected variant instead of the blowthrough option ?

I don't know that much about either solution but I think you have more room for tuning and improvement with an injected setup, especially with a blower motor. Of course, it's lots more involved.
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

pro70z28
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Re: Firewall Project

#8 Post by pro70z28 » Wed Oct 28, 2009 7:43 am

Injection would be cool but it's more $$$. And the carb will get me where I need to be HP wise, so I figured the extra expense wasn't worth it. They make some pretty exotic purpose built carbs for the pro charger these days.
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wikd69
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Re: Firewall Project

#9 Post by wikd69 » Wed Oct 28, 2009 11:00 am

pro70z28 wrote:Injection would be cool but it's more $$$. And the carb will get me where I need to be HP wise, so I figured the extra expense wasn't worth it. They make some pretty exotic purpose built carbs for the pro charger these days.
I'm running this 427 with a 671 roots on it, 2 x 750 boost referenced carbs, the standard setup. I have it tweaked so it's pretty reliable for street use but will turn on when needed. I have been drooling over the idea of doing a ProCharger build for it tho, with injection, etc. I looked at stepping up to some Dart Pro 1 heads, a lumpier roller and prolly the F2 (go big or go home). Problem is this little street car isn't built (cage-wise) to do anything faster than 10.0 and I don't think I want to start chopping it up to go that fast. Ah well. The grass is always greener, huh ? :mrgreen:
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

pro70z28
Posts: 146
Joined: Sat Aug 04, 2007 12:24 pm

Re: Firewall Project

#10 Post by pro70z28 » Fri Oct 30, 2009 9:10 pm

Mine will look something like this (but with a carb.)

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wikd69
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Re: Firewall Project

#11 Post by wikd69 » Fri Oct 30, 2009 11:51 pm

pro70z28 wrote:Mine will look something like this (but with a carb.)

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Any idea what sort of HP you'll be making ?
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

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John_Heard
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Re: Firewall Project

#12 Post by John_Heard » Sat Oct 31, 2009 6:38 am

Any reason not to go with the gear drive? Besides $$$ ? Seems like that is the hot ticket now.

pro70z28
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Re: Firewall Project

#13 Post by pro70z28 » Sat Oct 31, 2009 3:18 pm

John_Heard wrote:Any reason not to go with the gear drive? Besides $$$ ? Seems like that is the hot ticket now.

I just like that blower belt whine I guess. But, I won't be buying the procharger for a while yet. (maybe next year) so I have time to change my mind.

H.P. will be in the 1,500 range. If I keep the weight around 3,000 Lbs. that should be about all it will handle with a mild steel chassis.
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John_Heard
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Re: Firewall Project

#14 Post by John_Heard » Sat Oct 31, 2009 4:47 pm

They still whine a ton with a gear drive, and reliability is vastly improved from what I've seen with the cars around here. Some of the guys used to put a new belt on every pass or two.

pro70z28
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Re: Firewall Project

#15 Post by pro70z28 » Sat Oct 31, 2009 5:28 pm

Thanks for the info. John. I'll have to look into that. I'll have to research what the initial $$$ difference is. If it's not a huge difference it sounds like it might be made up in less maintenance $$$. That would keep the Pro Charger head lower too. I'm not sure what my hood clearance is going to be that far forward, Although I do have the engine pretty low in the rails. After the firewall is built the next project will be mounting the front end (1 piece fiberglass). Then I'll be able to measure all that out. :idea:
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