4Cruisers
SILVER Star
Should be a 6mm bolt 10mm in length, with captive lock and flat washers - Part Number 91651-40610.Not sure if that's the right bolt.
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Should be a 6mm bolt 10mm in length, with captive lock and flat washers - Part Number 91651-40610.Not sure if that's the right bolt.
Mine is a 10mm if I recall. But I have a 2f manual from the early 80’s and many of the bolts are smaller in the book than they are on my truck, which is an 87.Should be a 6mm bolt 10mm in length, with captive lock and flat washers - Part Number 91651-40610.
Compression test as of recent reads
185
175
176
165
175
180
FSM says max PSI is 149
91 octane with octane booster does nothing ive tried it and it still pings. Ive seen online some people get shims the place under the head gasket. I could calulate how much thickness I would need and have one laser cut?Compression test gauges are notoriously not reliable. (Aka inaccurate). I wouldn’t put much credence on those numbers until they’re verified with a high quality compression gauge.
Maybe those high numbers are correct- but you’ve got to verify against another gauge before considering drastic measures.
While the manual states a pressure range up to 149 psi - thats probably to fall in spec using regular octane fuel. If you use premium fuel, the compression can be higher.
I’d just drive it carefully using premium fuel and listen carefully. I don’t think a double head gasket or a thicker one is the answer (my guess not based on experience).
Try it. At this point what’s to lose?91 octane with octane booster does nothing ive tried it and it still pings. Ive seen online some people get shims the place under the head gasket. I could calulate how much thickness I would need and have one laser cut?
Yeah I was thinking the same thing..... Online looks like some do a gasket - shim - gasket. But then that would be too thick. Im not sure I could source a material as thin as I would need. It would be neat If I could find shorter pistons. I could always maybe throw a 3f crankshaft in it but thats alot of work I want to avoidThe head gasket has raised metal lips around every opening to act as seals. If a cloned thin metal sheet is placed between the gasket and block or head, the contact surface of thin metal and engine block/head won’t have anything to seal with. Just a flat piece of metal.
It SEEMS like that would be prone to a leak.
2f Timing, The 3fe is same cam profile but its a few degrees differentStock cam? Longer duration / later intake closure will reduce dynamic compression.
I havent heard of that before, I'm going to look into itAnother labor intensive job, but an option is to reshape the combustion chamber a bit (adding back volume). It seems like the 3FE could use some de-shrouding (I don't know if that's the correct term) around the valves anyways.
If im thinking correctly, Just throwing on the 3FE CAM gear should help reduce the dynamic compression with its 5* advance. What cam setup did you use?Stock cam? Longer duration / later intake closure will reduce dynamic compression.