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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 1:31 am 
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Joined: Fri Aug 17, 2018 9:33 pm
Posts: 57
That is good to know.
It's a lunati item I purchased before I joined the forum otherwise I would've got you to spec and supply one Brent. I just gave you all the specs. I think one that let the engine rev a little higher could have maybe squeezed out a few more ponies.
It is a little noisy as you predicted also.
I've only got the pre load at 1/8 turn at moment, is it worth going to 1/4 to see if that helps a little?


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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 7:11 am 
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I doubt it, but you can try.

The noise you hear is actually the acceleration of the valvetrain and possibly the quick closing of the valves against the seats.

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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 8:53 am 
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Posts: 214
I've found the morels to be noisy . It is said that they require a thinner oil, something along the lines of 10/30 or even thinner.
Motor seems to nose off rapidly after hitting 5900. Might be a control issue within the valvetrain.


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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 9:04 am 
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Just depends on the intensity of the lobe. I exclusively use Morel lifters and they are quiet with the lobes I use.

I would expect the cam to hang on a little longer too, dropping 35 hp in 200 rpm isn’t normal. Those aggressive lobes need a lot of spring pressure.

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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 4:54 pm 
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I used the the Pac 1207x springs which were measured at 154 seat and 414 open with my cam at full lift, would've thought that would be plenty?


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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 4:58 pm 
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I'm using a 10w-40 semi synthetic oil with a kinematic viscosity of 13.5.....


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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 5:14 pm 
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It's plenty and on the border of too much open pressure.

Even though the kinematic viscosity looks fine, you may want to try a 10W-30 for giggles.

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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 6:11 pm 
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Got pretty good oil pressure with the 10w-40, around 75 at revs and 35 or so at idle, measured from back of the block so the 10w-30 is worth a shot next oil change....


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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 6:46 pm 
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blykins wrote:
I doubt it, but you can try.

The noise you hear is actually the acceleration of the valvetrain and possibly the quick closing of the valves against the seats.


Noise can come from a lot of different sources in a hydraulic valvetrain including having too much spring load for the lifter which causes it to collapse more than the height of the closing ramp. A cam that's been ground with a bunch of base circle runout can cause a lot of problems in a hydraulic valvetrain too and that can cause it to lose control early.


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 Post subject: Re: 377C dyno results
PostPosted: Sat Feb 02, 2019 8:15 pm 
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Joined: Fri Mar 01, 2013 9:58 pm
Posts: 214
XAFALCON wrote:
I used the the Pac 1207x springs which were measured at 154 seat and 414 open with my cam at full lift, would've thought that would be plenty?


I'd have thought those springs would have been more than sufficient for that setup. Personally, used those springs and ran up to 6500 without loss of control like you are seeing.
I don't think springs are your issue on this one but try a 30 weight for shits and giggles to see if it makes a difference .
FWIW, I know of hydro roller setups that will run past 7k with the right setup.


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