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#21
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I just want to make sure I understand WHERE you drill. If I understand correctly you drill the "plate" that is basically the base of the stat. This is the part that covers the openeing in the manifold. Not the covering around the valve in the center of the stat?? Or did I get it backwards ??? ( Probably)
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67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s |
#22
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You are correct its the plate. The flat thin metal outside the valve. Hope it helps.
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72 Lemans |
#23
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I tried that (drilling holes) T-stat mod a while back on my race car to replace the restrictor since I had blocked the stock bypass passage.. If you drill the T-stat your bypassing it while valve is shut. No need for bypass hole from intake to timing cover. I blocked the passage with a small piece of flat plastic behind rubber o-ring.
This forces ALL the coolant to pass throught the radiator rather be bypassed back into motor. It did improve my cooling while siting in long staging lines such as Norwalk.......... Just plug it next time you pull intake...........
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ECM member. 2008 Outlaw Pontiac Drag Series Champion MANDRA Do it now fool! Life is short. 69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far.. through mufflers. 1.26 60'. Going back to track with pump gas engine.... My 60 Ventura retired to street/strip duty.. |
#24
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I will post a couple of other cooling ideas once I get them written up concerning by-pass strategies.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#25
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Quote:
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"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
#26
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Had a little more time tonight.
I have used three different methods to by-pass around the thermostat for additional cooling, (I still put two 1/8" holes in the edge of the stat to purge air). On a tri-power intake, I have added a fitting on the waterneck part way up the length and connected a by-pass hose to a unused opening in the water cross-over. I put a restriction in the line to get the waterflow I wanted. Putting one in the fitting works too. On 4 bbl intakes I have used a Moroso thermostat "chimney" and added a bypass hose to the same manifold location mentioned above and then either used one of the drilling in the part or added a new one to connect the hose to. The third method I have tried once but liked a lot was to add a by-pass hose from the cross-over to the top of the radiator tank. I could by-pass a lot of water with this deal and was able to find the "sweet spot" in flow for the engine I was working with using a ball valve for the restrictor. Have no idea what the actual orifice size worked out to but it was worth doing. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#27
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I just went thru this recently as well...I would recommend that instead of drilling holes it is better to grind the perimeter of the thermostat w/flats @ 120* intervals. I did this with a bench grinder and don't have to worry about drill chips in the thermostat. The water will flow around the outside of the thermostat and there is still enough material left for the the thermostat to register in the counterbore/goove of the water crossover.
Herb
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74 Ventura 462/#13 heads/3350# 10.38 @ 128.89 MPH, N/A, Stock suspension, 275/60 Radial, Street legal, Tagged & Insured |
#28
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72 Lemans |
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