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Messages - c9zx

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136
FE Technical Forum / Cam opinions wanted
« on: March 01, 2012, 03:26:07 PM »
4.25 bore 3.98 stroke Barry's stageX Eds with 10.0:1 SCR 91 octane pump gas in a street car (Cobra, 2500lbs). I like your opinions on a solid flat tappet. Would like to see peak power 5700-6000, So far my thoughts are 248/254@ .050, 110 LSA, .620/.635. All input is very welcomed. Thanks, Chuck

137
FE Technical Forum / Re: cam ideas
« on: September 21, 2011, 07:08:49 PM »
After a lot of re-thinking almost everything, let me approach this a second time. 2500 lb. Cobra, no vacuum accessories, TKO 600 trans., 3.55 gear, Genesis 4.250 bore, 4.125 stroke, 6.700 rods.The Diamond pistons PN 42510 (468 CID) yield 10.87 with the piston .005 in the hole. The first priority is that the engine must run on 91 octane pump premium with no high speed detonation. The heads are still Edelbrock 72cc, Stage-X (Barry R.), intake is still BT dual plane, 850 HP or "true" 950. Please look at the following cam specs on a solid flat tappet and give me your opinions especially regarding the detonation issue. I'd rather leave power on the table than fail the cam and/or the engine. All input is appreciated. 294/300 Adv. Dur., 248/252 Dur. @ .050, 109 LCA, install on 105 .620/.630 lift. Is there something to be gained by using slower ramps on the exhaust lobe?  Thanks, Chuck

138
FE Technical Forum / Re: cam ideas
« on: September 18, 2011, 09:25:10 AM »
The heads, intake, and block are bought, the rest not yet decided on. Thanks for everyones input and help.  Chuck

139
FE Technical Forum / Re: cam ideas
« on: September 16, 2011, 02:18:46 PM »
I didn't mean to confuse things (vacuum) with reference to a different engine for a different car. Thanks for the input on CR needing to be increased to move the peak HP to 6000 or so. You guys are confirming that I'm trying to have a foot in two different worlds with this build, I need to make some adjustments to the "plan". Maybe shorten the stroke to lower the displacement and set CR at 10.5:1 to keep the usable RPM range. Modern pump gas is a real curse. Please keep the advice coming. Clearly I can use the help.  Thanks, Chuck

140
Non-FE Discussion Forum / Cam Master needed to solve mystery
« on: September 16, 2011, 02:03:49 PM »
Recent build, 408C, 9.5:1 CR, blue thunder intake, 750 Holley HP, iron Ford CC 4V heads minor porting good valve job, 305/197 cfm @ .600. cam is solid flat tappet. Dynoed 529 HP@ 6400rpm, 496 TQ @ 4900rpm. No vacuum leaks. Cam specs: 272/282 adv. dur., 238/248 dur. @ .050, 146/155 dur. @ .200, 110 LCA, installed @ 106. The mystery is best vacuum in neutral @ 1250 RPM is 10.5 in./hg. In gear, 1050 RPM, 8.5 in./hg. Best vacuum occurs with 16 degrees initial, no vacuum increase at 20 degrees initial, total without vacuum advance is 34 degrees. Best vacuum/idle quality is with idle volume screws set at 1 3/8 turn out, about .028 of all 4 transfer slot uncovered. I was expecting 13-15 in./hg. I have wasted days trying to find a problem or an explanation for the low vacuum. I'm officially stumped. Anyone have any thoughts on the subject? All input appreciated.  Thanks, Chuck

141
FE Technical Forum / Re: Genesis block
« on: September 16, 2011, 08:01:12 AM »
Glenn, Thanks for the information. I'm glad I asked the question. There seems to be much for me to learn before the build.  Chuck

142
FE Technical Forum / Re: cam ideas
« on: September 16, 2011, 07:58:21 AM »
Paulie, The engine is going into a FFR "Cobra". Thanks for the discussion of the ramps. I'm dealing with a fast ramp cam in a 408C right now. Runs very well but, very low vacuum. Thanks, Chuck

143
FE Technical Forum / Re: cam ideas
« on: September 15, 2011, 04:46:14 PM »
Blue Thunder single 4V, 850 or 950 Holley or Quick fuel carb.  Chuck

144
FE Technical Forum / Re: cam ideas
« on: September 15, 2011, 02:28:17 PM »
Thanks for the input. Do you think the the 306S is a good match with the currently planned 10:1 CR? Do you feel the Edelbrock stage-X E/I ratios are good enough to run the straight duration and lift cam. Thanks, Chuck

145
FE Technical Forum / Re: cam ideas
« on: September 15, 2011, 08:35:58 AM »
I'd like to see it make peak power about 5800-6000 RPM with max RPM being 6500 RPM. The rear gear is 3.55:1 (light street car) with a Tremec TKO 600, 2.87 1st, .82 OD. I'd like to see it idle at or below 1200 RPM. No particular HP number as a goal but, it seems that 510-520 should be doable. Thanks for the help.  Chuck

146
FE Technical Forum / Re: Genesis block
« on: September 15, 2011, 08:26:15 AM »
Thanks for all the input. The block has not been purchased yet and it looks like I need to do some more homework. The main cap issue is disturbing even though this is only a 525 HP build.  Chuck

147
FE Technical Forum / cam ideas
« on: September 14, 2011, 08:42:44 AM »
I'm looking for suggestions on a solid flat tappet cam. I'm particularly interested in overlap and LCA (LSA) as well as intake valve closing point. Engine is Genesis, 4.25 bore, 4.125 stroke, 6.700 rods, Edelbrock Stage X heads from Barry R, 10:1 CR, pump 91 octane gas, 2500 lb car (fun street car), no vacuum accessories, manual transmission. I've looked at numerous vendor listing and they seem to be all over the place on specs. All input appreciated. Thanks, Chuck

148
FE Technical Forum / Re: Genesis block
« on: September 14, 2011, 08:30:52 AM »
Thanks for the information.  Chuck

149
FE Technical Forum / Genesis block
« on: September 13, 2011, 11:47:58 AM »
I'm planning a build using a Genesis block. This is the first time I've built an FE since 1977 so I need to get current again. Any quirks, peculiarities, or problems I should be aware of? Thanks, Chuck

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