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| Project 3400 Roller Cam Block (Page 1/78) |
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lou_dias
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JUL 27, 06:49 PM
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lou_dias
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JUL 28, 04:19 PM
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lou_dias
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JUL 28, 07:42 PM
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AutoTech
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JUL 28, 08:03 PM
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What kind of camshafts are available for these blocks?
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lou_dias
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JUL 28, 08:43 PM
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While there are aftermarket cams shafts available, I didn't bother as none of the manufactures post their spec and I haven't seen any 3400 dynoes where a significant difference was made in power.
I was trying to use 1.7 rockers but none are available in the narrow body style that our heads require. So I am stuck with the .273" * 1.6 ratio = .4368" lift on the intake and exhaust. HOWEVER, this is a roller cam and should still have the valve open at max lift for a longer duration than a typical hydraulic cam. Hence still more overall lift than let's say an H260 but probably not as much as an H272 cam. Let's not forget the friction reduction benefits as well. This cam produces peak power @ 5200 rpm which is right where I want it for a happy street motor. The H260 cam produces peak @ 4500 rpm with .432/.458 using 1.52 rockers for comparison. Stock Fiero cam is .390"/.410" with a peak power @ 4800 rpm using stock 1.5 ratio rockers.
My tagert rwhp is 180 using the above ported, polished and shortened intake and a modified Fiero exhaust system...smashinging my own record of 150 rwhp with the Fiero intake in a NA motor without a bottle of NO2 using a 3.4 pushrod motor.
EDIT: Had to fully qualify my "record" before 10 people said I was full of it.[This message has been edited by lou_dias (edited 07-28-2006).]
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Joseph Upson
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JUL 28, 08:49 PM
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Make sure the injectors are 12 ohms, GM and Ford used peak hold injectors in some applications, the peak hold type will ruin the injector drivers in the stock fiero ECM. If you are interested in different cam specs Schneider racing reground my cam to turbo specs for a reasonable price.
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lou_dias
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JUL 28, 09:19 PM
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| quote | Originally posted by Joseph Upson:
Make sure the injectors are 12 ohms, GM and Ford used peak hold injectors in some applications, the peak hold type will ruin the injector drivers in the stock fiero ECM. If you are interested in different cam specs Schneider racing reground my cam to turbo specs for a reasonable price. |
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Well, it's too late for me there. However, what's a reasonable price? I've seen camshafts go for $300 and $400 with no published specs... I did find one for $200 but the manufacturer never got back to me on specs... I want a street motor. Your cam defines that. 5200rpm peak if fine by me. Actually perfect.
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AutoTech
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JUL 28, 09:39 PM
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lou_dias
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JUL 29, 11:54 AM
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I don't mind. I'm all about people giving GOOD information vs. non-real-world-theory.
Read my first or second post about the pushrods. After I bought them and my machinist said "Why are they thicker and have to machine the guide plates?"...I asked Fierosound and he said "When I told Smith Brothers the length I needed, that's what showed up. I never asked for 3/8" diameter." Interestingly when I ordered them from Smith Bros, the guy thought I was weird for asking them to be 3/8" thick. Live and learn...
As for the compression on dished pistons, I think it's in the archives...does make for a cheaper turbo-friendly block.
As for lifters, I haven't seen a need for aftermarket ones. Why do you think you need aftermarket ones?
Also, I think I have to revise my hp estimate as I am pretty sure this 6-speed in a Fiero will incur a much higher driveline loss due to Archie's solution for taking up the space between the deeper housing of the 6 speed and our flywheel... 170rwhp. I did buy a Fidanza aluminum fly wheel, but I don't think I've offset enough weight and it does make shifting a bit (ok, alot) unpleasant with the stock flywheel and a 2.8 when I was driving it before the motor swap.
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lou_dias
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JUL 29, 12:12 PM
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Maybe it was the SPEC clutch, I don't know, I've always liked the way the stock clutch grabbed evenly. I've never driven a car with a SPEC clutch but it doesn't look much different than stock. I've also never driven a G6 or GTP with this transmission, so I could be off base. We'll see what a difference the aluminum flywheel makes in a few weeks...
For now, my recommendation is - enjoy your Getrags...
edited for spelling...[This message has been edited by lou_dias (edited 07-29-2006).]
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