Help me plan for a 2FE
- Thread starter RockDoc
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And get that fan shroud on there !
Awesome work Rock!
My delta 262 pulls 15" at sea level. Leakdown is less than 2% as well. It's just the overlap:]
Awesome
BTW my Delta 250s cam pulls 17" vacuum . I would expect the 262 to pull less as its overlap is much more than the 250
BTW my Delta 250s cam pulls 17" vacuum . I would expect the 262 to pull less as its overlap is much more than the 250
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- Thread starter
- #249
Got it back from exhaust this afternoon and took it out for a run to "road tune" the timing. The exhaust guy is somewhat suspicious that my muffler may be crapped out since the downpipes were getting really hot and the gasket at the base of the manifolds wants to blow out...... but he also thinks that it could just be spitting out hot exhaust due to being a fresh rebuild (and I also had the timing bumped back till I got the exhaust on to quiet it enough to hear pinging). So, I'll run it for a while as is to break things in, then take it back in for new gaskets and discuss whether a new muffler is called for.
It definitely revs smooth. I've only had it to 4000 rpm so far, but it's like butter up to there. Another speed run on the highway gave 0-100 at 16.1 sec, right around where it was without the exhaust redone... but this was in a different spot, so I'll have to check again where I ran it with the 3FE. The engine seems to be trying to rein in the idle speed some now, wavering right after start up, but it still idles around 1300 in neutral once warm.
All in all I am happy, but still have some tinkering to do, and hope it gets stronger as it breaks in.
It definitely revs smooth. I've only had it to 4000 rpm so far, but it's like butter up to there. Another speed run on the highway gave 0-100 at 16.1 sec, right around where it was without the exhaust redone... but this was in a different spot, so I'll have to check again where I ran it with the 3FE. The engine seems to be trying to rein in the idle speed some now, wavering right after start up, but it still idles around 1300 in neutral once warm.
All in all I am happy, but still have some tinkering to do, and hope it gets stronger as it breaks in.
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- Thread starter
- #250
Took if for another run after playing with the timing a bit more. You don't notice the bump in torque so much when accelerating, but it sure holds hills nice now. 
Something I would have had a hard time holding at 2400 rpm in overdrive before, I can slowly accelerate on starting from 2000 rpm at the base.
So using very unsound statistical practices (dash clock stopwatch and not all the same stretch of road) here are some numbers, my 62 used to do 0-100km/h in just under 28 sec which dropped to 27 with the install of an extreme valvebody. With that change the 80-110km/h time dropped from 16.6 to 15 sec.(these runs were done on a slight incline from what I recall)
Just before the 2FE install, the 3FE powered the 62 to 100km/h in 19.3 sec. It now hits 100 in just under 16 sec, for a bump of ~20% in power when the torque convertor is mostly free. The 80-120 time has dropped from 16.5 to a touch under 12 sec for a power increase of ~38% with the convertor locked up across the range of 2500-4000 rpm
The truck has also gained a bit of weight between the 3FE and most recent 2FE runs, due to the heavier bottom end, and the re-installation of my bullbar and winch, which I had pulled prior to the 3FE run)
When I get a bit of disposable cash again, I think I'll have to get something a bit better for a muffler, cause I have a stinking suspicion that there is some power to be had in uncorking the exhaust a bit more.
Something I would have had a hard time holding at 2400 rpm in overdrive before, I can slowly accelerate on starting from 2000 rpm at the base.So using very unsound statistical practices (dash clock stopwatch and not all the same stretch of road) here are some numbers, my 62 used to do 0-100km/h in just under 28 sec which dropped to 27 with the install of an extreme valvebody. With that change the 80-110km/h time dropped from 16.6 to 15 sec.(these runs were done on a slight incline from what I recall)
Just before the 2FE install, the 3FE powered the 62 to 100km/h in 19.3 sec. It now hits 100 in just under 16 sec, for a bump of ~20% in power when the torque convertor is mostly free. The 80-120 time has dropped from 16.5 to a touch under 12 sec for a power increase of ~38% with the convertor locked up across the range of 2500-4000 rpm
The truck has also gained a bit of weight between the 3FE and most recent 2FE runs, due to the heavier bottom end, and the re-installation of my bullbar and winch, which I had pulled prior to the 3FE run)When I get a bit of disposable cash again, I think I'll have to get something a bit better for a muffler, cause I have a stinking suspicion that there is some power to be had in uncorking the exhaust a bit more.
My headers are also very much warmer than before the rebuild - is it not a characteristic of the higher compression and longer camshaft ?
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EGT should increase w/ more open valve duration, due to cylinder blowdown starting earlier in the cycle.
EGT should decrease w/ higher CR, due to better thermal efficiency.
EGT should decrease w/ higher CR, due to better thermal efficiency.
I am wondering what the effect of Doc's internal engine coatings has on EGT?
This is great! I have a 60 ready to donate drivetrain for my 62 this fall. And I plan on keeping the motor and accessories to do a 2FE later. This thread has been killer to give me an idea of what I'm getting into. Thanks RockDoc!!
- Thread starter
- #256
The exhaust guy I took it to felt that a fresh rebuild will have high EGTs at first, which is why he held off on telling me I need a new muffler right then. He said that an engine he built years ago ended up burning off the header coatings right away and the speedshop guy he got them from told him that you should never run coated exhaust on a fresh rebuild... but still replaced the headers for him. Don't know if there is truth to this, but....
Good to know. I also wondered if having sluggish spark timing had an effect, since I didn't want to play with that till I could hear the engine over the exhaust.
I suspect that may play a decent role too.
- Thread starter
- #258
The high idle issue turned out to be a break in one of the wires to the ISC valve, rather than something inherent to the 2FE set up. Bypassed the break and it idles right where it should now although it has a little lope 
although it has a little lope 
The lope is caused by your camshaft being out of round. LOL
