SBC 388 S/C Weiand 177 Help in Tuning - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-20-2012, 08:02 AM
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SBC 388 S/C Weiand 177 Help in Tuning

Hello, I'M Mauricio from chile and i have problems tuning my engine, ok let's describe engine:

Chevrolet 388, 3.75 Stroke, 6" Rod, Je Pistons -28cc dished 0.60 , Edelbrock Performance cylinder head 70cc (i will check it), Clevite 77 tri metal bearings, Weiando 177 at 5psi, 3" free Exhaust per head, Holley Avenger EFI TBI 900cfm,
Crane Cams CRN-119661 camshaft, Mechanical advance distributor with MSD 6AL, i spin it at 6000rpm redline, i have wideband and pyrometer but doesn't get it right tuning because my EGT get very high over 1500 F, i use 10:1 A/Fr (Maybe too rich?, but i melt pistons couple of time and i don't want it to happend again), timing 32-34 at 2600rpm (maybe too much?), i have a Water Methanol kit controlled by the Holley Avenger but i don't know how much % of Meth/wather against fuel i must throw inside.

Any tips will be apreciated

pd: Sorry for English

edit: i have like 7.9 8.0 compression ratio, maybe it's to low for 5psi?, i dont want more than 5psi, also all my rotating assembly is Forged, and i'm attatched to a th400

Mauricio

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Old 04-20-2012, 10:37 AM
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i have 97 octanes RON, i know how to tune the efi, im running 10:1 10.5:1 intentionally, is too much?, im worry about the HIGH EGT issue, i will try the 28 , i dont use a carb because is an engine for hillclimb and a carb quench

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Old 04-20-2012, 10:49 AM
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Fuel is 97 OCT, i will cubicate cylinder heads cc, the cam isn't advanced (should I?, i have the timing set that allows it, but is at 0), the engine works almost always at heavy load, there are long hills like, longest maybe 2-3 minutes WOT Full Load
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Old 04-20-2012, 11:23 AM
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i think i run 2.33, but my boost gauge read 5-5.5 at full load,
cam sheet http://www.cranecams.com/product/car...detail&p=24188, i will check real CR
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Old 04-20-2012, 11:45 AM
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i got like 7-8 psi when it's 350cid, now at 383 it makes 5psi, i will check my gauge also, it use to make good power, i compare it to a 350hp 350Ci i have and it's moves really better than it, im now waiting to get some new pistons cause piston melt, but im from CHILE, so i have to buy it in U.S.A. and wait them to get to my hands, i dont know if im 2.33 or 2.10, i will check all, i dont degree camshaft, i just put them at the timing set mark with no advance
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Old 04-20-2012, 12:20 PM
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Quote:
Originally Posted by F-BIRD'88
If you are rebuilding this motor. build it with a true verified 7.5:1 compression ratio. OR LESS

Now you know what the result is when you just throw it together and wing it.
im sure that the heads are 76cc stock, but last time i have to rectify them so i dont really know how cc them have now, btw i dont found piston with more tan -28cc dish, for 1.125 pin diameter and 4.060bore 6" rod
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Old 04-20-2012, 12:38 PM
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spark advance is only mechanical, not vacuum advance, i got all advance at 2500-2800rpm like 32, al sensor are above supercharger
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Old 04-20-2012, 12:43 PM
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Ok, i will measure all the stuff i have here, thanks for your help
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