Cheapo BBC 505 build
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| − | + | =Cheapo BBC 505 tall deck grunt motor= | |
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| + | ==Overview== | ||
| + | *I'm always interested in researching street/strip combinations that are easy on the budget. This is a combo based on the tall deck 427T block. | ||
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| + | ==Specs== | ||
| + | The block deck height of this block is 10.200", 0.400" taller than a regular production 396/427/454 block. The total combined stack measurement of parts I've used here is 10.185", leaving 0.015" nominal piston deck height on a virgin block. I'd check the decks for being square with the centerline of the main bearing bore and if they were, I might leave them alone and use a gasket such as this for a squish of 0.056". You can put this same motor together using a standard production 427 or 454 block, you just use 6.135" rods instead of the 6.535" rods used in this build and forget about the spacer plates. | ||
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| + | ==Parts== | ||
| + | *[http://www.summitracing.com/parts/FPP-1071/ Head gaskets] | ||
| + | *[http://www.summitracing.com/parts/SCA-945420/ Crank] | ||
| + | *[http://www.jegs.com/i/Eagle/356/CRS65353D/10002/-1 Eagle 6.535" rods ] | ||
This makes a 505 in a tall deck short block for cheap. | This makes a 505 in a tall deck short block for cheap. | ||
| − | Continuing with relatively cheap.. | + | ===Continuing with relatively cheap=== |
| − | + | *[http://www.summitracing.com/parts/CCA-11301-02/ Racing Head Service cast iron heads], 119cc chambers for 10.2:1 static compression ratio. | |
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| − | + | Published head flow factored by 0.90 (90%): | |
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| − | + | Lift/Int./Exh. | |
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| − | + | .100 68 56 | |
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| − | + | .200 149 106 | |
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| + | .300 221 144 | ||
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| + | .400 278 176 | ||
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| + | .500 306 206 | ||
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| + | .600 324 223 | ||
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| + | .700 338 239 | ||
| − | Use these Moroso rectangular port spacer plates between heads and intake manifold, using | + | Use these Moroso rectangular port spacer plates between heads and intake manifold, using *[http://www.summitracing.com/parts/MOR-65090/ Edelbrock #7202 intake gaskets] on each side of the plates.... |
| − | + | *[http://www.summitracing.com/parts/EDL-7163/ Edelbrock RPM intake] for rectangular ports | |
| − | + | *[http://www.summitracing.com/parts/EDL-7562/ RPM Air Gap] for rectangular ports | |
| − | Edelbrock | + | *[http://www.summitracing.com/parts/WND-8018/ Weiand Stealth] for rectangular ports |
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| + | ==Dyno simulations== | ||
The following DynoSim pulls were made with large-tube, equal-length headers through mufflers and an 850 carb.... | The following DynoSim pulls were made with large-tube, equal-length headers through mufflers and an 850 carb.... | ||
More than one professional engine builder has advised that big block Chevies eat flat tappet camshafts, so be aware. I have composed three different pulls, with the only changes being the cam. One hydraulic flat tappet, one hydraulic retro-fit roller tappet and one solid flat tappet combination. I didn't build these to be race motors, but rather low-buck street/strip grunt motor combinations that nose over at 5500. I went through about half a dozen cams on each combination and am publishing the best results here. | More than one professional engine builder has advised that big block Chevies eat flat tappet camshafts, so be aware. I have composed three different pulls, with the only changes being the cam. One hydraulic flat tappet, one hydraulic retro-fit roller tappet and one solid flat tappet combination. I didn't build these to be race motors, but rather low-buck street/strip grunt motor combinations that nose over at 5500. I went through about half a dozen cams on each combination and am publishing the best results here. | ||
| − | I'll run the retro-hydraulic roller motor first. I used 1.8 rockers | + | I'll run the retro-hydraulic roller motor first. I used 1.8 rockers for a new lift of .552"/.572". |
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| − | + | http://www.compcams.com/Cam_Specs/C...x?csid=445&sb=0 (link broken) | |
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| − | + | RPM HP TQ | |
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| − | + | 2000 193 508 | |
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| − | + | 2500 245 515 | |
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| − | + | 3000 311 544 | |
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| − | + | 3500 386 579 | |
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| + | 4000 455 600 | ||
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| + | 4500 508 593 | ||
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| + | 5000 546 573 | ||
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| + | 5500 555 530 | ||
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| + | 6000 490 429 | ||
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| + | *Peak volumetric efficiency 97.6% @5000 | ||
| + | *Peak BMEP 178.2 @4000 | ||
| − | This combo uses a hydraulic flat tappet cam with stock 1.7 rockers. | + | This next combo uses a hydraulic flat tappet cam with stock 1.7 rockers. |
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| − | + | http://www.compcams.com/Cam_Specs/C...x?csid=397&sb=0 (link broken) | |
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| − | + | {{Note1}} When Comp says "9.5 compression", they don't mean that it specifically needs 9.5 exactly, they mean that it needs AT LEAST 9.5 and could use more. | |
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| − | + | RPM HP TQ | |
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| − | + | 2000 198 520 | |
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| − | + | 2500 251 526 | |
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| − | + | 3000 316 554 | |
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| − | + | 3500 391 587 | |
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| + | 4000 460 604 | ||
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| + | 4500 514 600 | ||
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| + | 5000 555 583 | ||
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| + | 5500 558 533 | ||
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| + | 6000 517 453 | ||
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| + | *Peak volumetric efficiency 98.7% @5000 | ||
| + | *Peak BMEP 180.4 @4000 | ||
| + | ===Solid cam=== | ||
Now here's one for those of you who don't mind checking valve lash maybe twice a year, although you could probably stretch it to yearly with the technology used today. Back in the day, this used to be a frequent chore, but not so much today. See, the thing is that once you get the lash set properly with the motor hot, you allow it to cool and check where the lash is. Then you can set it cold from then on and encounter no muss or fuss. | Now here's one for those of you who don't mind checking valve lash maybe twice a year, although you could probably stretch it to yearly with the technology used today. Back in the day, this used to be a frequent chore, but not so much today. See, the thing is that once you get the lash set properly with the motor hot, you allow it to cool and check where the lash is. Then you can set it cold from then on and encounter no muss or fuss. | ||
| − | http://www.compcams.com/Cam_Specs/C...x?csid=482&sb=0 | + | |
| − | + | http://www.compcams.com/Cam_Specs/C...x?csid=482&sb=0 (link broken) | |
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| − | + | Used stock 1.7 rockers: | |
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| − | + | RPM HP TQ | |
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| − | + | 2000 200 526 | |
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| − | + | 2500 255 535 | |
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| − | + | 3000 323 566 | |
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| − | + | 3500 403 604 | |
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| + | 4000 478 628 | ||
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| + | 4500 540 630 | ||
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| + | 5000 584 613 | ||
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| + | 5500 600 570 | ||
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| + | 6000 567 496 | ||
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| + | *Peak volumetric efficiency 94.4% @5000 | ||
| + | *Peak BMEP 188.0 @4500 | ||
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[[Category:Undeveloped articles]] | [[Category:Undeveloped articles]] | ||
| + | [[Category:Undeveloped Engine articles]] | ||
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