Knock, Knock, Whos There? Help!

[Scoobum]

I would want to build it one time and not have to dig into the engine again for years

This is my philosophy

Unfortunately. ..it rarely works in the real world. KR can be kept under control with an adequate fuel supply...but some just can't get that through their heads. I beat on my junk most weekends spring to fall...and have yet to lose a pair of head gaskets to KR...tho I did orbit a pair accidently overboosting an engine one time. KR will pound rod bearings into tinfoil...as what happened here.

You can be as vigilant as all get out in regards to KR...but mechanical issues will rear their ugly head. I've personally cracked two rockers...had a piston pin come loose and score a cylinder all to hell...and had a cylinder crack into a water jacket so badly the crack went to the top of the cylinder...and I had to toss the block. These engines are 30 years old and have had the shit beaten out of them by God knows how many previous owners. Sooner or later...yer' gonna break stuff.

[deathraider6996]

Ok, from this vast amount of information, I have come to the final conclusion that I will be going with a flat tappet. 212/212 I think will be the sweet spot for my build. The only shortfalls my combo has which are still pretty hefty are stock heads, pt51 turbo, and the dutt neck Intercooler. If one is to know my goal of a 50/50 street/strip build with the ability to go low eleven then backed off a little to around 11.4-11.6 then those items are not too bad. I believe my converter might be a little too tight as I was told it is a 3200 lockup which is(from my research) a bit tight for a 51.

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[deathraider6996]

212/212 off the shelf cam...roller or flat tappet take your pick...turbo.. . a good convertor.. a good set of heads...and boost...will get your ass down the track in a hurry. But no one listens.

I'm listening. I'm just making an informed decision from all informed opinions stated.

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[larrym]

My 2800 stall suits me I run a 61 mm BB turbo on slicks at the track I got a 1.60 60' on the street it is perfect my has a similar setup with a 3200 stall he has to pedal it I mash the throttle and go very little wheel spin.

[deathraider6996]

My 2800 stall suits me I run a 61 mm BB turbo on slicks at the track I got a 1.60 60' on the street it is perfect my has a similar setup with a 3200 stall he has to pedal it I mash the throttle and go very little wheel spin.

Interesting. I mash my pedal also and don't spin at all. 10psi launches. 275 60 15  Mt Dr

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[Scoobum]

Unless you have a quality convertor built to your exact build and goal...then the stall speed could be anywhere. Weight of the car...low gear tune...exhaust housing size...cubic inches...all have an effect on it. This 16930 I have stalls far lower than the 3000 at 0 PSI. Now if I dial in lots of low gear timing...and pull low gear fuel...then it comes up closer to 3000 than Erics chip on the defaults.

[good2win22]

Unfortunately. ..it rarely works in the real world. KR can be kept under control with an adequate fuel supply...but some just can't get that through their heads. I beat on my junk most weekends spring to fall...and have yet to lose a pair of head gaskets to KR...tho I did orbit a pair accidently overboosting an engine one time. KR will pound rod bearings into tinfoil...as what happened here.

You can be as vigilant as all get out in regards to KR...but mechanical issues will rear their ugly head. I've personally cracked two rockers...had a piston pin come loose and score a cylinder all to hell...and had a cylinder crack into a water jacket so badly the crack went to the top of the cylinder...and I had to toss the block. These engines are 30 years old and have had the shit beaten out of them by God knows how many previous owners. Sooner or later...yer' gonna break stuff.



Such a Debbie downer!  LOL! Hopefully everyone realizes this but one can always hope that nothing comes apart and treat it nice so that it doesn't come apart. 

[Scoobum]

I remember Grumpy saying he went to the corner store for a loaf of bread one time...and the crank broke.

[reality]

  Finally some real world  results with no innuendo! And thanks OP for understanding. you will do all right.

10 psi launches  and 60 ft times at 1.60 Man I can only dream.
Actually that's my project this year.
Can some of you numbers guys critique this=2.1 60's and 26 mph back half. How much will a 1.60 60 ft time affect the 1/8 and 1/4 performance.

[good2win22]

I remember Grumpy saying he went to the corner store for a loaf of bread one time...and the crank broke.

That would be my luck

  Finally some real world  results with no innuendo! And thanks OP for understanding. you will do all right.

10 psi launches  and 60 ft times at 1.60 Man I can only dream.
Actually that's my project this year.
Can some of you numbers guys critique this=2.1 60's and 26 mph back half. How much will a 1.60 60 ft time affect the 1/8 and 1/4 performance.

Dude... You can foot brake it and launch with boost in the high teens.  Don't dream it, make your reality!


Get your suspension dialed in.  Find the instant center.  Get some sticky tires. Practice your launches.  Keep copious notes.


I have read that your 60 foot time is usually 14-16% of your overall 1/4 mile ET.  If under 13% or over 17%, then it wasn't your best pass down the track

[larrym]

  Finally some real world  results with no innuendo! And thanks OP for understanding. you will do all right.

10 psi launches  and 60 ft times at 1.60 Man I can only dream.
Actually that's my project this year.
Can some of you numbers guys critique this=2.1 60's and 26 mph back half. How much will a 1.60 60 ft time affect the 1/8 and 1/4 performance.

I think every .10 to gain in the 60' is close to .20 on ET.

My 1.60 was a 7 psi launch I even managed a 1.69 with Nitto Drag radials that aren't supposed to hook.

[Steve Wood]

0.1 in the sixty usually brings 0.15 at the quarter for a mid eleven car.  On a ten second car, it brings closer to 0.2 at the quarter.

26 in the last half is very good...suspect the car was lagging in the first half due to too rich an AF or something else.

Short times depend on two things.  Horsepower and traction.  The average 11.5 car will pull about 1.60-1.68 short times.  An upper ten second car will usually pull about 1.50

Trap speeds are the best indicator of how much power you have at the rear tires.  Short times are indicative as to how well you are putting it to the ground.

[Steve Wood]

Rated stall speed means nothing...it's how it works in your car

If you can launch at ten psi, that turbo should spool on up without hesitation.  You are not supposed to spin the tires...you spin, you lose.  You are supposed to go forward instantly.  A large rear sway bar really helps these cars launch well.  If the suspension is preloaded a bit, there should be no need for air bags, imo

The better converters will flash on up with the boost, yet they will not give you that slipping feeling and they will be tight and streetable at lower pedal input.

[deathraider6996]

Next question.. I bought an fbody radiator which I installed right before I pulled the motor. I ran it once for maybe 5  minutes. Should I be worried about the possibility of  contaminants? Neither of the head gaskets blew so I'm guessing no. Oil cooler was deleted prior to the install of the new radiator..

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[Steve Wood]

should be fine.   Question that I have is where did the white smoke come from?