What did you do to your BG(part 8)

[worldhazard]

changed plugs and wires! woohoo!!!

I've going to be replacing the steering and suspension in time, but I have noticed one thing in the past week. Kinda sketch.. If i get hard on the throttle, I can feel vibration through the pedals. I don't get this feeling in the steering wheel at all. Just the floorboards and pedals.

I was wondering if maybe somehow when the trans got replaced, something funny with the axles happened? I can gradually accellerate (normal person driving) and not notice it, but if I get on it, it shakes like a wheel is wobbling..

Oh, I FIRST noticed it after the first time I did some really aggressive driving. after i felt it, i babied it home..

[MazdaNoob]

double check your motor mounts ?

[KAinjection]

Sonic costing costed $35 per block. (we did 5 blocks to find the best. One block was actually cracked, and the rest had slightly thinner walls. Normal cost of a single block is $55, but since we were doing so many, the cost went down per block.) Boring costed $100.

Thats a good price considering I emailed the the guys at the link I posted about how much to bore and sleeve the block..... are you ready?

Bare block with sleeves, ready to be built up:
$1500 (block)
$250 (gasket)
$75 (shipping)
$1825 total*

I was expecting more like 500-600 range.

[93BlkOnGreenPro]

Remeber he just bored their block. It was not sleeved.

Sent from my Evo 4G using Tapatalk 2.

-Dj

[KAinjection]

I know, I was just comparing the 2 options. Bore and sleeve or sonic test 5 blocks to find a good one and just bore it out.

Non-boosted street engine, so what Racerboy did is more then likely the option I will take.

[yunvmyegt]

Today we began tearing down a buddys turbo egt, check the classifieds for some of the parts we got off today....also got to drive it last night what a difference a gtr turbo has over mine , im jealous...lol...

[Racerboy]

I know, I was just comparing the 2 options. Bore and sleeve or sonic test 5 blocks to find a good one and just bore it out.

Non-boosted street engine, so what Racerboy did is more then likely the option I will take.

Keep in mind, the engine will overheat easier with thinner cylinder walls. We only run this engine for a short amount of time when racing it, as the feature races are only 25 laps long. I don't think I'd run that big of a bore on the street for that reason. Stop and go traffic will really heat up an engine compared to running at speed. Plus, we don't have a grille or headlights on this car, so it gets a bit more air in the engine bay and through the radiator.

[KAinjection]

Keep in mind, the engine will overheat easier with thinner cylinder walls. We only run this engine for a short amount of time when racing it, as the feature races are only 25 laps long. I don't think I'd run that big of a bore on the street for that reason. Stop and go traffic will really heat up an engine compared to running at speed. Plus, we don't have a grille or headlights on this car, so it gets a bit more air in the engine bay and through the radiator.

lol, how?

This is another one of those myths that need to be broken.

The heat in the combustion chamber is still the same regardless if the piston is 83mm or 85 for a given A/F ratio. The only difference is the time it would be taking for the heat to enter the coolant passages since there is less material for the heat to go thru then before.

As long as your coolant system is working fine, there would be no danger of overheating it anymore then a stock block.

The only danger there might be is if the engine actually did overheat, you could possibly distort your cylinder walls vs a stock block, but still seems kind of doubtful since we dont have free standing cylinders like KL's or Hondas.

Sit in your car, let it idle and see how long it takes to build heat, and now rev it to 6K and see how long it takes. The only difference between you and I will be your moving and I am not.

My point here is this, who is actually generating more heat and stress on the engine?


Just so you know, your actually slowing your car down by not having the grill and headlights in the car, now the front is a large air scoop, unless thats how your racing body wants you to run.

[Racerboy]

No, to big of a bore can cause overheating. Quoted from a guy on the ford bronco forums: "If you consider where the heat is created, it is not even through the whole cylinder. The very top gets more heat then the bottom. The wall is exposed to flame longer. Cylinder pressures are higher the further up the piston is.

The wall doesn't conduct straight to the water, it conducts in all directions. So some of the heat is driven up toward the deck, some of it is driven down toward the bearings.

Thinner walls will cool the bore faster as the heat can't travel through the bore up and down (not enough material for heat to flow) and the heat will be driven into the water faster.

Now we have a condition where the same amount of heat is being driven into the water in a smaller zone. Since the iron pathway is smaller the heat has to go somewhere. So localized heat at the top of the bore, but not as much being driven up and down the cast iron.

Once you start getting localized hot spots, cooling goes to hell. Vapor bubbles block flow, heat builds at the bubble as it is an insulator to the water, life sucks."

Also, you'd be surprised how long it takes for our engines to heat up while racing. I don't even use a fan for at least the first 30 laps, and when there are 10 laps to go, I turn the fan off again (And I switch off the alternator, to reduce drag on the engine.) I don't have any issues anymore with overheating. Also, we run distilled water & water wetter, which has a higher heat tolerance before it starts to boil, compared to a 50/50 antifreeze solution. So, add those things all up, and you do have potential for overheating. I'm not saying you will. I'm saying there's a good chance of it.

Also, yes, we have to run without anything blocking the front of the car, as they want somewhere to point a fire extinguisher. Sometimes hood pins are hard to remove quickly if the car is wrecked badly, but the holes where the headlights and grille were are always there.

[KAinjection]

Quoting some guy from another forum doesnt = proof

You havnt given me anything to backup your claim except what you have heard from other people and what you quoted from another forum.

Simple logic will tell you this is a myth. Who cares how fast the heat goes into the water, as long as the cooling system is working and adequate. Reread again what the guy wrote and you will see its completely illogical and he is just trying to make himself look smart.

Localized hot spots would come from paper thin iron, and uneven high spots (warped bores) where friction would be higher etc from the piston up and down motion, and in his theoretical explanation the water must be stationary and not ever constantly flowing? And if what he is saying is true and correct then all that would need to be done is to put a higher pressure cap on the cooling system to raise the boiling point, or no?

If this myth is true, you will find out running it on the track before i will running it on the street.

[Racerboy]

Quoting some guy from another forum doesnt = proof

You havnt given me anything to backup your claim except what you have heard from other people and what you quoted from another forum.

Simple logic will tell you this is a myth. Who cares how fast the heat goes into the water, as long as the cooling system is working and adequate. Reread again what the guy wrote and you will see its completely illogical and he is just trying to make himself look smart.

Localized hot spots would come from paper thin iron, and uneven high spots (warped bores) where friction would be higher etc from the piston up and down motion, and in his theoretical explanation the water must be stationary and not ever constantly flowing? And if what he is saying is true and correct then all that would need to be done is to put a higher pressure cap on the cooling system to raise the boiling point, or no?

If this myth is true, you will find out running it on the track before i will running it on the street.

First of all, I don't think you understood the quote.

Second, I'm just quoting the post for simplicity on my part. I didn't want to have to type it all out. And I know it's not a myth. I've seen it happen first hand. The school I go to had a project engine that the class played around with and we had it happen to us after we overbored it one to many times. It never happened before we overbored it that last time. And why do you say the water has to be stopped. He didn't say it did. And hot spots do form from the ways you listed. But they don't "have" to be paper thin. They can be thicker, and just be uneven inside the coolant passage. Keep in mind, the bp block is cast. And cast iron blocks aren't perfect when it comes to coolant passages. They are uneven. And uneven means thinner areas in some spots, and that can cause the coolant to bubble.

Also, yes, the cap pressure can be raised. But only to a certain extent. We are already planning on running a 25lb cap. You can't go much higher than that, if at all. Otherwise the pressure will be to high.

[KAinjection]

I fully understood the quote guy.

Go back and read and everything I said and it will be clear. I am not asking you questions because i dont know the answer to them.

Why didnt you state your experience in the first place? Would have made things a lot simpler wouldnt it?

Only reason i dont fully buy what your saying is because its at a school, far too many inexperienced hands have touched that engine just to bore it out one last time and its now overheating.

I am getting dizzy from all the circles your leading me in.

[Turpro]

Kind of want this put in its own thread.

[KAinjection]

I am cool with that, feel free to move the post where you see fit.

[wgnths]

drove it thru puddles yesterday as it rained hard, gotta love the no AC/heater and windows up during the rain. I need window visors bad, anyone know of some clean ones to get? The wagon had some before I started driving the car but they got trashed thru out the years and were too big besides they were blue too.