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Bead blasting heads
My heads are going for porting and valves guides etc,I have use of a bead blaster.Where is it safe to bead blast the heads ? all over or do I need to stay clear of the cam tower faces and barrel faces ?
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06-09-2009, 01:00 AM
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Join Date: Nov 2000
Location: Dallas
Posts: 3,584
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I'm no expert but I'd definitely stay away from any of the sealing surfaces and obviously the insides.
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Buck '88 Coupe, '87 Cab, '88 535i sold, '19 GLC 300 DD Warren Hall, gone but not forgotten |
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06-09-2009, 04:53 AM
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abit off center
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We bead blast all our heads, (all areas) glass beads have a very low probability of metal removal, in other words it will not change the dimensions.
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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06-09-2009, 05:23 AM
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Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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bead blast
We bead blast everything as well, just be sure that it is glass beads, and if you have a bit of gasket or some sealer on a machined area remove it instead of trying to blast a stubborn area for a long period.
Mike Bruns JBRacing.com
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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06-09-2009, 05:46 AM
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Forced Induction Junkie
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Quote:
To remove soft pliable material of the head, it's easier to use chemicals. Combustion chamber's carbon build up, it works great.
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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06-09-2009, 06:40 AM
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cheers guys degrease then in the blast cabinet tomorrow with a very fine bead
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06-09-2009, 12:50 PM
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Join Date: Jul 2000
Location: So. Calif.
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Quote:
Sherwood |
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06-09-2009, 01:46 PM
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Less brakes, more gas!
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Just be careful how you move them around in your cabinet... You do not want to put scratches in the surfaces from your cab. grate.
-Michael
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 Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS |
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06-09-2009, 02:51 PM
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Ok guys I will be careful but while I have your attention
 I will be having a valve job and mild port carried out.I have Jenveys which taper from 48mm to 41mm would you open the 39mm inlets to 41mm or leave a step ? BTW I have searched on here and read up on this but still cant decide which way to go
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06-10-2009, 03:00 AM
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Blend
Mr P,
Blend them through, no question. andy |
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06-10-2009, 03:56 AM
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Forced Induction Junkie
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Blend them, no question.
Anytime there's a transition step, you stand the strong possibility of fuel dropping out of the mixture and causing uneven fuel mixture distribution, especially at lower RPM's.
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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06-10-2009, 06:20 AM
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The Ark
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
1985 Porsche 930 Fac. Slantnose 3.3l
Ugly Betty
