Using E85 Pump Gas

Power Numbers
Test 1 shows the best power numbers from our first dyno test of the Magnuson 122 blower from the Sept. '06 issue. Static compression was 8.6:1 and max boost was 7 psi at 6,000 rpm. This test was performed on 91-octane pump gas.

Test 2 used forged Speed-Pro pistons, which bumped the compression to 10.2:1, a Quick Fuel 750 annular-discharge carburetor, and E85 fuel. Max boost was 7 psi but at a low 3,300 rpm. At peak power, the boost was only 6 psi.

Test 3 replaced the stock iron Vortec heads with a pair of aluminum 215cc TFS heads and a set of Crane Gold Race 1.6:1 roller rockers. Compression was slightly lower, but we added a smaller 2.70-inch-diameter blower pulley to generate 10 psi at peak torque and 12 psi at peak horsepower.

RPM	TEST 1		TEST 2		TEST 3
TQ		HP	TQ	HP	TQ	HP
2,000	412	162	---	---	550	209
2,200	426	178	---	---	563	237
2,400	449	205	---	---	575	263
2,600	462	229	---	---	587	290
2,800	476	254	---	---	599	319
3,000	470	268	537	308	611	349
3,200	480	292	535	325	620	378
3,400	495	320	545	354	626	406
3,600	500	343	551	379	630	432
3,800	511	370	554	400	631	456
4,000	512	390	555	422	630	480
4,200	512	410	555	444	628	502
4,400	510	427	551	462	624	523
4,600	509	445	540	474	618	542
4,800	500	457	523	478	610	558
5,000	499	475	506	481	599	570
5,200	490	485	494	489	587	581
5,400	472	485	491	505	575	591
5,600	461	491	485	519	564	601
5,800	449	496	459	507	541	598
6,000	441	504	386	441	484	552
6,200	420	496	283	335	---	---