everything matched up real close. My friend was quite impressed at the casting quality and milling of my head. He has torn down several different GM motors and they weren't anywhere near the quality of mine.
How many miles before rebuild on 4.5l 24 valve motor
- Thread starter Bigbeast
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R
robbie
Guest
It was not just the porting and polishing of the head that creates my Power in the engine, but a whole package. Boreing it out to the max toyota size psiton (1 mm over (.040)). Milling the surface of the block .010", Milling the head .025", this raises the compression level quite a bit. by math is should be around 10.5 to one compression. So orginally the compression in a stock engine is 9/1. By porting an polishing I allow more air to set next to the valve and more flow through the head with less turblence. By Porting and polishing the exhaust, I allow ease of exhaust exit and more flow. Allowing the engine to breath better. later robbie
decking the block and milling the head throws off your valve timing don't it.
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robbie
Guest
Yes they throw off the timing. I returned mine to factory by sloting the timing chain guide and putting tension on the guide in a different way to shift the timing gear. I measured the lift at different degrees before TDC on a stock engine and returned it to these figures. On my wifes !fz i did not return it to stock timing and she has better HP at higher end. I have better Torque at higher RPM. It is all a game to have fun with. later robbie
[quote author=robbie link=board=2;threadid=13841;start=msg131040#msg131040 date=1080852961]
On my wifes !fz i did not return it to stock timing and she has better HP at higher end.
[/quote]
What and how much milling was done to her motor?
On my wifes !fz i did not return it to stock timing and she has better HP at higher end.
[/quote]
What and how much milling was done to her motor?
My personal opinion is that 90% of the time it is just not worth rebuilding an engine. By the time an engine is worn out, so is everything else. After you are done with the motor, then you need to do the trans. and then the rears. The ball joints don't have grease fittings so they need to be replaced too. Then the electrical stuff starts malfunctioning. It isn't so much the money, it's the agravation (sp?) and the down time.
I've seen too many friends and relatives brag about their freshly rebuilt engines only to find out 6 months later there was body rot or some new problem that they didn't anticipate with the end result being that the car was sold for parts or delivered to the junk yard.
The way I see it, my L.C. averages 15K miles per year. By the time I hit 300K (and I plan on keeping it until I do) it will be 20 years old. After 20 years, I will retire her gracefully to whoever will take her and be thankful for the time we spent together.
I've seen too many friends and relatives brag about their freshly rebuilt engines only to find out 6 months later there was body rot or some new problem that they didn't anticipate with the end result being that the car was sold for parts or delivered to the junk yard.
The way I see it, my L.C. averages 15K miles per year. By the time I hit 300K (and I plan on keeping it until I do) it will be 20 years old. After 20 years, I will retire her gracefully to whoever will take her and be thankful for the time we spent together.
[quote author=97 Land Bruiser link=board=2;threadid=13841;start=msg131093#msg131093 date=1080858292]
I've seen too many friends and relatives brag about their freshly rebuilt engines only to find out 6 months later there was body rot or some new problem that they didn't anticipate with the end result being that the car was sold for parts or delivered to the junk yard.[/quote]
Were they Landcruisers? Were they imports? My guess, is no to both questions
I've seen too many friends and relatives brag about their freshly rebuilt engines only to find out 6 months later there was body rot or some new problem that they didn't anticipate with the end result being that the car was sold for parts or delivered to the junk yard.[/quote]
Were they Landcruisers? Were they imports? My guess, is no to both questions
>> If you are a Cruiser nut then putting money into an engine rebuild at 150, 250, or 300k miles is simply an investment in keeping one of the world's best vehicles in service. <<
My thoughts exactly. I had a 60 for about 18 years and had the 80 not been a better truck, I would have not upgraded (the 60 was rusting and that's a $$ item).
As long as I'm into wheeling, I'll keep my 80 and sorry 100 guys, it's the last of the best for med->heavy wheeling.
On my 60 I had replaced/repaired all the usual suspects (alternator, starter, water pump) and that engine would run forever (3B). On the 80 I think the electrical stuff might be limiting factor (if you consider the HG as PM). If I get 20+ more years from it I'll be 66+ and that'll be fine, they can bury me in it.
I think I might have to weld a cover over the sunroof somewhere in between.
Riley
- 100's are nice too, make a great second truck if I had the dough.
My thoughts exactly. I had a 60 for about 18 years and had the 80 not been a better truck, I would have not upgraded (the 60 was rusting and that's a $$ item).
As long as I'm into wheeling, I'll keep my 80 and sorry 100 guys, it's the last of the best for med->heavy wheeling.
On my 60 I had replaced/repaired all the usual suspects (alternator, starter, water pump) and that engine would run forever (3B). On the 80 I think the electrical stuff might be limiting factor (if you consider the HG as PM). If I get 20+ more years from it I'll be 66+ and that'll be fine, they can bury me in it.
I think I might have to weld a cover over the sunroof somewhere in between.
Riley
- 100's are nice too, make a great second truck if I had the dough.