My 1.6TD Compound Turbo is up and running, 30psi of boost in neutral! - page 4 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.
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#45 by Alcaid on 16 Aug, 2016 01:30
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I would be more scheptical about taking them out of their press fit tolerance bore, having to machine the top of them or the profile they sit in to get them to the perfect install height and then press fit them again into the same press fit tolerance bore, now already used once before.
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#46 by rumbling_caddy on 17 Aug, 2016 01:13
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Wouldn't EGT skyrocket with so much boost and fuel? Is this setup only for a drag strip?
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#47 by Alcaid on 17 Aug, 2016 01:23
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Wouldn't EGT skyrocket with so much boost and fuel? Is this setup only for a drag strip?
Boost actually cools down EGT if it is produced efficiently. with 60 psi total boost both turbos are operating very efficiently at only 18-19psi each. A proper build head also helps, better flow = cooler operation. It is my trackday car, not for the dragstrip. -
#48 by Jetmugg on 17 Aug, 2016 17:22
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I can personally attest to what happens with too much fuel for a given amount boost. It's not pretty. I was running about 40 psi of boost from a single turbo, but still too much fuel when this happened.....
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#49 by rallydiesel on 10 Oct, 2016 18:56
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I still enjoy this build after all this time. Are you going to use ARP studs? I'm surprised to hear about the stud failure. That guy had some big builds himself.
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#50 by Alcaid on 11 Oct, 2016 04:37
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I still enjoy this build after all this time. Are you going to use ARP studs? I'm surprised to hear about the stud failure. That guy had some big builds himself.
Using ARP now, they hold 60psi boost and a ***load of fuel no problem. My head however has washouts around all 4 injectors so no way to get injectors to seal anymore. My fault, in a hurry to get it up and running an my cam can be timed correct and 180deg off - and guess what I did..... :p Will build a new head and try again but project has been put on shelf for a little while as I just bough a new house so money will be spent on other stuff for a while. -
#51 by Toby on 11 Oct, 2016 20:00
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What do you mean by "wash outs"?
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#52 by Alcaid on 12 Oct, 2016 06:37
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What do you mean by "wash outs"?
You know the shoulder that you bottom out the injector and heat shield against? It's not there anymore - the aluminum has melted away by exhaust that has made it's way out the injector holes. Even washed out the head sheads and one injector shows signs of erosion as well... -
#53 by RabbitJockey on 12 Oct, 2016 11:41
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that is unfortunate, congrats on the new house
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#54 by Jetmugg on 17 Oct, 2016 17:33
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Sorry to hear that about your cylinder head, Alcaid. This has not been a particularly good year in the VW world in terms of pushing HP limits and damaging engines.
Steve. -
#55 by air-cooled or diesel on 17 Oct, 2016 17:48
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especially you steve, id say turn the fueling down a 'notch' or 2, and the turbo down 2 'notches' as well. you busted the class on top of yours, right? the 1.9 class, you ran faster than that, last year.(in a 1.5 class). so youll bust the same records a notch or 2 slower, and hopefully do some saving at the engine.
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#56 by Jetmugg on 18 Oct, 2016 13:43
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Yeah - I broke 2 engines this year - nobody to blame but myself. I am making a promise to myself to go a little easier on the "tune ups" for 2017. I'm tired of breaking stuff, buying new parts, and paying machine shop bills.
You are right, at Bonneville, the 1.5L record we hold is faster than both the 2 liter and the 3 liter record.
At Ohio, the 1.5L record we hold is faster than the 2 liter, 3 liter, and 4.25 ( G, F, and E).
I think there's a lot of room for improvement in all those classes, particularly as the DT classes become more popular with wider availability of small diesel engines.
Alcaid has had his problems this year, and Darrell Vitone has blown up a couple (I believe 2) air cooled engines running land speed events in California.
This is a good time of year to start setting specific goals for 2017 and start working towards them.
Steve.
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#57 by theman53 on 19 Oct, 2016 08:01
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Meanwhile the engine I have has been running great and cool. I think besides buying my head the next time you could run a little more gear to get the rpms up steve. I wish you were buying my head, I know it would help you.
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#58 by air-cooled or diesel on 26 Oct, 2016 17:41
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I wish you were buying my head, I know it would help you.
(obvious sales pitch(hehehjoke).
well if your talking about vw air-cooled engines, they have a serious problem when you add racing before name of motor or after. you see the problem right there, its right in front of you, pretty obvious, yep you got it,,its -the cooling. you have a stock air-cooled motor, stock shroud, stock fan setup (w/generator or alt), no cooling problems, then again its rated for about 4500rpm, springs i think, cam stock isnt any better. mild performance, not many immediate cooling problems, put this guy on a track, (hi-performance) and about 4grand (4.5k i think) the fan belt just slips. so cooling efficiency gets very low. and these guys are easily getting up to 7k rpms and more, i mean there were a slew of CA shops with performance cams, and extensive setups. all you needed to start up above 4.5k rpms to 7k rpms, was basically a set of high-rev springs. so some 'racers' used a power pulley, well it wasnt very good for the street, and for the track maybe marginal, and well youd get air, but at a reduced speed, amount. so the majority of speedsters deleted main fan shroud, and fan, pulley, take a pair of electric fan blowers, one to each bank of cyls, well youd get some air for cooling, and iirc none to oil cooler, then again for a 1/4 mile volume of oil getting hot, or overly hot isnt the problem. cause your running an extra 'oil pan'(too). this is most bug, typeI racing, drag, 1/4 mile, so they went in many spots to 1/8 track racing. i dont know what they did for specs for the kaffer cup racing they did, but the drags, would get hot spots, for a stock case, and you now over-bore for (foolish) over-big jugs, you may not get a couple of runs, you could shoot out of the starting blocks(first time), and blow the base of a cylinder. it just adds up. and your guy there is trying to do what a 3mile run, a good few runs in a weekend. i havent seen type4 motors punched out, or hopped up, then again the T4 motor i had had i looked like a direct drive fan, fan may have been part of cam, well that may just limit you right there, you cannt direct-drive-drag crank(&cam). so you can only get so much cooling off this set-up. porsche had a good fan set-up, it was single v-belt, with a generator. motors could rev up to oh about 7grand, i never had a cooling problem. then again (and these were early 70s models) if you were a kid, you might want to stick you hand down fan and see,,,well, old set-up.