I'll grab someone and check it at the weekend. Cheers
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| Notes after the top end rebuild http://classiccamaroclub.mfatw.com/viewtopic.php?f=5&t=2717 |
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| Author: | onemanrace [Mon Dec 17, 2012 11:26 pm ] |
| Post subject: | Notes after the top end rebuild |
Right - finally got the girl back from the garage recently. Took her for a spin up the local bypass, and I've noticed a couple of things. She's had the intake polished, and I believe, a slight porting. The valve seats have been polished as well. And now, I think, I'm hearing what might be induction roar? Anyone else noticed anything like this after similar work? Or is there something else going on? Also, there's a bit of vibration about 60+, settling just about 70. The wheels were balanced not so long ago, but maybe a check on the balance and alignment might help? Could a prop shaft balance help? I'll see if I can get a video of the noise I'm getting at speed and at WOT. |
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| Author: | Rocky [Tue Dec 18, 2012 8:45 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
You shouldnt hear much change if any in the intake unless its a major porting job. Induction roar normally comes from a leak in the intake tract unless you have high flow air filters, Check your idler arm for play that can cause vibration at speed. |
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| Author: | onemanrace [Tue Dec 18, 2012 11:02 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
Cheers Rocky. The idler arm is a Moog item, so I haven't bothered to change it when I did the tie rods and sleeves, but I'll get it checked out. As far as I know, it wasn't a major port job - gasket matched and a bit of a polish was about it, I believe. I am running two OEM-style K&N panel filters on it - that wouldn't be enough would it? To be honest, my first thought was that something hasn't been tightened properly on the intake. It's had a full set of new intake gaskets installed so I can well believe something's not quite been nipped up or something. I'll pop her back for a chat and a check I reckon. |
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| Author: | Rocky [Wed Dec 19, 2012 8:04 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
If its sucking more air its normally before the throttle body if you blip the throttle while under the bonnet you should be able to hear if there is a leak. |
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| Author: | onemanrace [Wed Dec 19, 2012 8:40 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
I'll grab someone and check it at the weekend. Cheers
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| Author: | ukzz4iroc [Sat Dec 22, 2012 8:13 am ] |
| Post subject: | Re: Notes after the top end rebuild |
Yeah you shouldn't really hear any difference with the work done, sounds like something else. Vibes probably d/shaft or wheels. You could have thrown a weight or something. Does it go at 70mph + ? My advice is don't drive 60
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| Author: | onemanrace [Sat Dec 22, 2012 3:12 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
She was a little bit hesitant this morning. Had to nip out to meet someone for a greasy breakfast about 15 minutes drive away, and when we stopped at lights, instead of idling nicely at 7500, she was hunting a little above and below, as low as 5000. Then as I was parking her, she stalled. So, I'm going with "There's a leak somewhere in the intake" option. |
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| Author: | ukzz4iroc [Sat Dec 22, 2012 3:59 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
7500? She's idling a tad high
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| Author: | onemanrace [Sat Dec 22, 2012 6:29 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
 This is what happens when I'm posting with not enough sleep. Yeah, extra 0 in there... |
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| Author: | onemanrace [Sun Dec 30, 2012 4:41 pm ] |
| Post subject: | Re: Notes after the top end rebuild |
Just took her out to wash her... small puddle of oil on the garage floor. 
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