 Anyone ever bought from "German Auto-SACO"?, Should I trust 'em |
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| SGB |
 Jul 27 2004, 03:28 PM
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just visiting  Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States  |
I was looking for info on dual springs for my valves, as well as seats for smaller stem diameter the SS valves use. I came accross this place. These look really interesting. Dual vlve spring, SS. I don't know price yet. I guess they are rebuilds. Anybody familiar with this outfit? I am really interested in SS valves anyway, and dual springs. Et voila, here they both are, with guides no less.
Hmmmmm..... Type Four Head German Auto Heads Feature Our Chromoly Seats, Silicone Bronze Guides, Heat Treated Keepers, Chromoly Retainers And Chromevanadium Valve Springs. All The Heads Feature Stainless Steel Valves. 21-0426 Type IV 48 x 38 Dual Spring (each) 071-101-061D Stock W/F-Ports (each) SACO page with type 4 heads I posted this question at Pelican and havent recieved any response. Maybe I need to find a bug forum? |
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| Jake Raby |
Jul 27 2004, 04:37 PM
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The charge developed by the 48mm valve (and huge port that normally still isn't 48mm)fills the cylinder to the point that the 38mm exhaust valve, nor the exhaust port can operate at 75%-80%...
We have seen this so many times on the flowbench and in engines... My 2600cc engines get no larger than a 44mm intake, and hardly any intake port enlargement, just some shape work. The 48x38 valves actually hurt the engine. Using a 48x38 valve arrangement I have seen flow numbers through the intake at 225 CFM, while the best exhaust port work would only flow 140 CFM.. More intake charge requires more exhaust charge! If you get less than 75% out of the exhaust of what enters the intake you are losing power... Consistently a smaller intake valve and port has made us more power. Thats why my 2270 C makes more power with 44x36 valves with a split duration cam than a 2600cc engine from another reputable shop that swears by 48x38 and straight pattern cam. Bigger is NOT better.... Hell my 3.0 only has a 52mm intake valve.... Wait till you see the numbers from those heads! on the first try we got 76% of the intake out of the exhaust! |
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Posts in this topic
SGB Anyone ever bought from "German Auto-SACO"? Jul 27 2004, 03:28 PM
Jake Raby 48x38.... would love to see that flow chart!
... Jul 27 2004, 04:05 PM rhodyguy jake, please go into a little more depth with your... Jul 27 2004, 04:17 PM rhodyguy well put. thanks. Jul 27 2004, 06:04 PM SGB Thankks so much Jake. I sure hoped you would chim... Jul 27 2004, 10:01 PM seanery is it the 494? I've got that one and am very h... Jul 27 2004, 10:12 PM SGB MAybe, but I doubt it. I confess, it is the hydr... Jul 27 2004, 10:28 PM Jake Raby Can't beat 42x36 if you are not doing any port... Jul 27 2004, 11:11 PM
SGB Jake-
Thanks again for sharing your experience wit... Jul 28 2004, 07:26 AM |
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