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  #76 (permalink)  
Old 08-16-2009, 02:16 AM
Rambler American -69
 
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Yes the cylinder edges are chamfered but still it feels a bit sharp. Maybe it's ok.

I found a huge dyno-tested list from Ryan's car page . It has a lot of combos of sbc 383 strokers with AFR heads.

Desktop Dyno 2000 has quite rough estimate of the intake manifold. Single-plane manifold seems to boost the hp reading a lot compared with dual-plane. Maybe I will leave to later because it's easy to change.

I have had some discussions about how to support the engine + transmission with elastic mounts. I was told that I should use the stiff motor mounts in the front and more elastic transmission mount. It was also suggested to use additional motor mounts at the rear part of the engine.

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  #77 (permalink)  
Old 08-16-2009, 04:29 PM
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take DD2000 with a grain of salt. it overstates the gain of the single over a dual because it does not model a good (great) dual plane hi rise design that well (rpm) The RPM is very hard to beat on the street and on the strip unless you launch from 4000+ and buzz the rpm very high.
(best average power output) But as a "trend" a single does often have a bit of and advantage at peak power. (at the cost of low/mid)
good illustration of the difference here

Last edited by F-BIRD'88; 08-16-2009 at 04:38 PM.
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  #78 (permalink)  
Old 10-22-2009, 05:07 PM
Rambler American -69
 
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I could get new set of hydraulic roller Comp Cams XR288HR + Comp Cams hydraulic roller lifters Pro Magnum 885-16 a lot cheaper than from the store. According to Desktop Dyno 2003 the peak hp would be somewhere between 6000-6500 rpm depending on the exhaust setup (0.555" lift w 1.6 rockers). DCR would be around 8.3:1 with this cam.

How much rod big end grinding I should be expecting with this cam? It's not small base circle cam, so who nows before assembly.

The cam selection is a huge jungle. Luckily the driving season is over and I have lots of time during the winter to think about different options.

I'm willing to set the max. rpm in the 6500 rpm range so I'm little concerned how hydraulic lifters can handle it.
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  #79 (permalink)  
Old 12-13-2009, 09:26 AM
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I decided to go with mechanical roller cam with small base circle + direct lube mechanical rollers from Howards Cams:

http://www.summitracing.com/parts/HRS-111313-06S/
http://www.summitracing.com/parts/HRS-91132/

Duration 246/0.05" and 286/advertised
0.621" lift with 1.6 rockers

I changed the cam bearings with cam bearing tool and assembled the transmission internals into new (old) transmission shell. I bought also cam degree kit.



Now I need a new timing cover + roller cam thrust button to handle the cam walk.

What do you guys think, is my 750cfm vacuum secondary holley enough or would you prefer 750-850cfm with mechanical secondaries?
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  #80 (permalink)  
Old 04-19-2010, 03:15 PM
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I have all the parts now. Just gonna pick up new set of bearings and gaskets and then I can assemble the engine with the mechanical roller.

Here's a video from my old setup with hydraulic flat tappet cam, 0-6000 rpm:
http://www.youtube.com/watch?v=lLKYpAdd1QA
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  #81 (permalink)  
Old 05-29-2010, 03:28 PM
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While doing a search here for stroker info, I ran across this thread. It's old-ish, but I still want to bring this to anyone's attention that may also see it.

I don't use Speed-O-Motive, so I cannot personally vouch for the accuracy, but the member who posted this is also trustworthy, IMO. Here's what he had to say on the subject, Post #13:

Quote:
Originally Posted by 345 desoto
I would very strongly suggest that you Google up Speedomotive before you buy ANYthing from them. I've read enough bad press about them to be cautious about them. For good quality stuff, you can't hardly beat Summit. There are plenty of GOOD supliers out there, that have spotless reputations. All it takes, for ME at least, is a couple of bad raps, and I stay away...
Online info is mostly hearsay. S-O-M may be fine. BUT- as always- verify ALL, trust NOTHING that you've not independently verified or know to be correct. Caveat emptor, et cetera.

Some other links- not "cherry picked", these were all on the first page of a 600,000-hit google for "Speed-O-Motive problems with":

speed-o-motive

http://forums.corvetteforum.com/c3-t...hem-again.html

http://www.fordmuscle.com/forums/all...-cranks-3.html
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  #82 (permalink)  
Old 05-29-2010, 03:55 PM
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While doing a search here for stroker cost info, I ran across this thread. It's old-ish, but I still want to bring this to anyone's attention that may also see it.

I don't use Speed-O-Motive, so I cannot personally vouch for the accuracy, but the member who posted this is also trustworthy, IMO. Here's what he had to say on the subject, Post #13:

Quote:
Originally Posted by 345 desoto
I would very strongly suggest that you Google up Speedomotive before you buy ANYthing from them. I've read enough bad press about them to be cautious about them. For good quality stuff, you can't hardly beat Summit. There are plenty of GOOD supliers out there, that have spotless reputations. All it takes, for ME at least, is a couple of bad raps, and I stay away...
Online info is mostly hearsay. S-O-M may be fine. BUT- as always- verify ALL, trust NOTHING that you've not independently verified or know to be correct. Caveat emptor, et cetera.

This is no reflection one way or the other to anyone who has a differing opinion and if S-O-M is better than their press leads me to believe, I'd welcome the info.
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  #83 (permalink)  
Old 11-21-2010, 11:53 PM
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Updated video:
http://www.youtube.com/watch?v=9fRQXxOVx1w

New crank and forged flat top pistons, balanced, zero-decked block.
Solid roller cam 0.62" lift

Next I will install new fuel system with return line and bigger fuel pump, Mallory 140 gph.
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