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| any problems running 1.6 roller rocker arms? (Page 1/2) |
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TVS
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JAN 17, 08:24 PM
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Hey Guys I have run 1.6 rocker arms on V8 to add a little more power without a problem just wondering how they are on the Fiero V6? Also has anyone found a full roller rocker arm that fits the 2.8L?
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Patrick
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JAN 17, 09:31 PM
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Be advised... unless restrictions in both the intake and exhaust are dealt with, the 1.6 roller rockers won't do much if anything for your 2.8 engine.
My thread chronicling my 1.6 roller rocker installation.
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82-T/A [At Work]
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JAN 18, 12:40 PM
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| quote | Originally posted by Patrick:
Be advised... unless restrictions in both the intake and exhaust are dealt with, the 1.6 roller rockers won't do much if anything for your 2.8 engine.
My thread chronicling my 1.6 roller rocker installation. |
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This was the big takeaway from that thread that I got:
"Any slight improvement in the higher revs has been negated by perhaps a slightly less responsive bottom end."
... but I will say, the engine sounded amazing in all of those videos!
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TVS
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JAN 18, 01:11 PM
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Good advice and I can easily do the intake and exhaust mods to match everything
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Patrick
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JAN 18, 07:45 PM
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| quote | Originally posted by 82-T/A [At Work]:
This was the big takeaway from that thread that I got:
"Any slight improvement in the higher revs has been negated by perhaps a slightly less responsive bottom end."
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Bingo!
I don't regret installing the 1.6 roller rockers all those years ago... but would I do it again knowing what I know now? No... not unless I was also planning to open up the major restriction in the upper intake manifold.
| quote | Originally posted by 82-T/A [At Work]:
... but I will say, the engine sounded amazing in all of those videos!
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Part of the reason why it sounded (and still sounds) good, is because I did remove the ridiculous restrictions in the factory exhaust logs. I have no idea what Pontiac was thinking leaving those restrictions in place. Shoddy fabricating is all I can figure.
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TVS
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JAN 18, 08:54 PM
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Thanks again Patrick I will be adding both mods to our to do upgrade list
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pmbrunelle
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JAN 18, 09:06 PM
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82-T/A [At Work]
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JAN 19, 04:29 PM
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| quote | Originally posted by Patrick:
Part of the reason why it sounded (and still sounds) good, is because I did remove the ridiculous restrictions in the factory exhaust logs. I have no idea what Pontiac was thinking leaving those restrictions in place. Shoddy fabricating is all I can figure. |
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I bought a set of hogged out exhaust logs from Ed Parks many many years ago... and that's what's on my Fiero right now (in storage). I bought a set of stainless shorty headers from WCF about a year ago. It came with a matched stainless Y-Pipe for a Getrag V6 along with EGR... so we'll see when I eventually get the car in my garage and sorted, what that sounds like. I'm nervous I went too big. I went with 2.5" exhaust from the Y-Pipe all the way to the muffler.
Most of the exhaust size charts I see show that I'm on the high-end... meaning that I don't really need 2.5", but that it's not too much. Somewhere between 2.25" and 2.5" would have been better. It'll be going with a 3.4 V6/60 which I'm going to really work over. My goal is to take it to a really, really competent machine shop that can balance everything to an obscene level, even though it won't produce power above ~5,700. I'm going with an H272 cam and 1.52:1 roller rockers, the ARI Racing ported cyl heads with the stainless swirl "tulip" valves. I'm also going with the 3.4 DOHC pistons (so ~9.7:1 compression), plus windage tray and everything I can possibly find. Finally, I'll have to do the DAWG mod on my already bored Darrel Morse intake plenum. We'll see... but I have to make ~200hp for the 2.5" exhaust to make sense... haha.
I've already got a stainless 2.5" catalytic converter that bolts in to the exhaust... but I need to pick a muffler. Goal will be to make the engine look as absolutely stock as possible, minus the obvious fact that it'll have shorty headers.
I'm going for something that would probably do mid-14s... but I'm in my mid 40s now... so I won't be doing any burnouts any time soon. I just want something that can really go in gear fast. I also bought a 5-Speed Getrag from a Quad-4 W41... so it has the crazy gearing.
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Spadesluck
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JAN 19, 05:55 PM
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When I rebuilt my 2.8 I did the Comp Cam's 260H cam, 980 springs, and 1.6 rockers. I also ported my own heads and hogged the exhaust. I did this because just like what is mentioned above is all this stuff worked in conjunction with each other. That motor was a very strong running 2.8.
Moral of the story...you need to plan all the parts out to have the best results.
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Raydar
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JAN 23, 12:55 PM
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Before adding 1.6 rockers, make sure that you'll have enough spring clearance, with the added lift.
With stock springs, I think that anything much greater than .45 valve lift will cause coil bind. If you're using a stock cam, the 1.6s should work fine.
My take is that, if you already have your engine apart, just buy the cam and kit that have the specs you want, if it's available.
| quote | Originally posted by Spadesluck:
When I rebuilt my 2.8 I did the Comp Cam's 260H cam, 980 springs, and 1.6 rockers. I also ported my own heads and hogged the exhaust. I did this because just like what is mentioned above is all this stuff worked in conjunction with each other. That motor was a very strong running 2.8.
Moral of the story...you need to plan all the parts out to have the best results. |
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That was the baddest 2.8 I've ever driven. It had as much "stones" as several 3.4s I've driven.  [This message has been edited by Raydar (edited 01-23-2025).]
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