Lots of questions

Ace417 · June 11th, 2009, 10:18 AM

Just have a bunch of questions that i would like some help with.
1. I see all this talk about bottom end and top end of an engine. What exactly comprises the top end or bottom end?
2. What is a timing chain for?
3. Whats the difference between a pushrod engine and a modular engine?
4. What is an overhead cam for?

I think thats all i have for now. any help is great!

06RedfireGT · June 11th, 2009, 10:36 AM

1. The bottom end is the rotating assembly, pistons, rods, crank. Top end is the intake manifold, heads, cams, valves, ect...

2. A timing chain links the cams to the cranks rotation so the intake and exhaust valves open in sequence to match the stroke of the pistons.

3. A pushrod motor uses a single cam shaft mounted in the center of the engine that uses steel rods to open and close the intake and exhaust valves which are inside the heads.

4. An OHC motor is just a different design of motor. The cams are in the heads driven by the timing chains instead of one cam in the center of the engine using push rods to open and close the valves.

Ace417 · June 11th, 2009, 10:39 AM

so our engines have 3 cams? the two on each side an one overhead, or am i wrong on this.

03SonicBoom · June 11th, 2009, 10:48 AM

Originally Posted by Ace417

so our engines have 3 cams? the two on each side an one overhead, or am i wrong on this.

No, they have 2 cams in the heads (one in each head). That's why they are SOHC (single over head cam) engines.

Pushrod engines have one cam in the block with 8 sets of lobes (I use this put as basic as possible). Each set of lobes controls the intake and exhaust valves for each cylinder. As the lobes turn they push on a rod that runs up to the heads. The other end of the rod pushes on the valves to open it.
The OHC engine has a cam in each head. Each cam has 4 sets of lobes for the 4 intake and exhaust valves in each head. These lobes push directly on the valves as they rotate.

Emay · June 11th, 2009, 10:48 AM

2 cams, one in each head..

Emay · June 11th, 2009, 10:48 AM

was slow..

Ace417 · June 11th, 2009, 10:50 AM

ohhh ok its starting to make sense. so pushrods have just the one cam in the center?

03SonicBoom · June 11th, 2009, 10:55 AM

Originally Posted by Ace417

ohhh ok its starting to make sense. so pushrods have just the one cam in the center?

Yeah, in the block. I edited my earlier posts a couple times before I liked it. Hopefully it explains things better.

06RedfireGT · June 11th, 2009, 10:56 AM

Yes.

Ace417 · June 11th, 2009, 11:05 AM

so then if theres intake and exhaust valves, why do we have 3? is that to make it 2 intake one exhaust per cylinder or the other way around?

I probably sound completely retarded to you guys but thanks! Im getting the gist of it.

usafimj · June 11th, 2009, 11:28 AM

HowStuffWorks "How Car Engines Work"

bamagt · June 11th, 2009, 11:29 AM

check these out:
Overhead valve - Wikipedia, the free encyclopedia

Overhead camshaft - Wikipedia, the free encyclopedia

gives you some visuals on the differences.

bamagt · June 11th, 2009, 11:31 AM

dang AF.....how could you link the guy to a chevy motor?

usafimj · June 11th, 2009, 11:35 AM

Well its not that I linked him to a chevy motor. I gave him a link to the basics which is where we all start to learn.

Ace417 · June 11th, 2009, 12:16 PM

do we have port fuel injection or direct fuel injection?

IronStomach · June 11th, 2009, 12:26 PM

ooooh pretty pictures

Direct injection is something Ford hasn't gotten to yet. There are some hopeful of seeing it turn up in the coyote, but even that probably won't have direct injection.

Ace417 · June 11th, 2009, 12:34 PM

gotcha. Those links were very helpful guys.

TheUNZippee! · June 11th, 2009, 12:39 PM

Rods, Pistons And Crank Basics - Popular Hot Roddins Magazine

Camshaft Basics - Tech Article - Chevy High Performance Magazine

Camshaft Choice - Camshaft Terminology - Tech - Hot Rod Magazine

HowStuffWorks Videos "Engine camshaft"

Car Maintenance: The Engine Explained

HowStuffWorks "Internal Combustion"

tzywen.com - Internal Combustion Engine Video

4-stroke internal combustion engine demonstration ( 4-stroke engine ) video clip

4-stroke internal combustion engine demonstration ( 4-stroke engine ) video clip

Four Stroke Engine Basics

HowStuffWorks "How Car Engines Work"

IronStomach · June 11th, 2009, 12:40 PM

Originally Posted by Ace417

gotcha. Those links were very helpful guys.

Yeah, thanks guys!

That how stuff works link usafimj posted mdae it clear why different grinds of camshafts have such different effects on the motor. Very fun use of a coffee break.

Damn I'm such a n00b.

unlicensed to drive · June 11th, 2009, 12:52 PM

Originally Posted by Ace417

so then if theres intake and exhaust valves, why do we have 3? is that to make it 2 intake one exhaust per cylinder or the other way around?

I probably sound completely retarded to you guys but thanks! Im getting the gist of it.

I don't know if there are 2 intake, 1 exhaust valves or 1 intake, 2 exhaust valves per cylinder, maybe someone in here can help out on this.

June 11th, 2009, 10:36 AM	#2
06RedfireGT One Man Wolf Pack 2006 Mustang GT 13ish....maybe Join Date: Aug 2006 Location: Regulatin On Some OGs Posts: 22,484 iTrader: 2 reviews	1. The bottom end is the rotating assembly, pistons, rods, crank. Top end is the intake manifold, heads, cams, valves, ect... 2. A timing chain links the cams to the cranks rotation so the intake and exhaust valves open in sequence to match the stroke of the pistons. 3. A pushrod motor uses a single cam shaft mounted in the center of the engine that uses steel rods to open and close the intake and exhaust valves which are inside the heads. 4. An OHC motor is just a different design of motor. The cams are in the heads driven by the timing chains instead of one cam in the center of the engine using push rods to open and close the valves. __________________ ΜΟΛΩΝ ΛΑΒΕ

June 11th, 2009, 10:48 AM	#5
Emay May 08 ROTM 2008 Audi S6 Join Date: Oct 2006 Location: S. Elgin Posts: 6,684 iTrader: 3 reviews	2 cams, one in each head.. __________________ FLICKR Unique Imagery

June 11th, 2009, 10:48 AM	#6
Emay May 08 ROTM 2008 Audi S6 Join Date: Oct 2006 Location: S. Elgin Posts: 6,684 iTrader: 3 reviews	was slow.. __________________ FLICKR Unique Imagery

June 11th, 2009, 10:56 AM	#9
06RedfireGT One Man Wolf Pack 2006 Mustang GT 13ish....maybe Join Date: Aug 2006 Location: Regulatin On Some OGs Posts: 22,484 iTrader: 2 reviews	Yes. __________________ ΜΟΛΩΝ ΛΑΒΕ

June 11th, 2009, 11:28 AM	#11
usafimj I Post Entirely Way Too Much 2007 Ford Mustang GT 12.847 @ 114.12mph Join Date: Sep 2007 Location: Oklahoma City, Ok. Posts: 5,086 iTrader: 1 reviews	HowStuffWorks "How Car Engines Work" __________________ 07 GT-- Gone But Not Forgotten Military Crew E-5

June 11th, 2009, 11:29 AM	#12
bamagt Enthusiast Last Three of VIN 666 13.7@104mph Join Date: May 2008 Location: Alaska Posts: 503 iTrader: 0 reviews	check these out: Overhead valve - Wikipedia, the free encyclopedia Overhead camshaft - Wikipedia, the free encyclopedia gives you some visuals on the differences. __________________ ~ 08 Alloy ~ JLT CAI ~ BBR Tunes ~ Comp Stage II NSRs ~ UDPs ~ MAC LT O/R Prochamber/Violators ~ Hurst STS ~ FRPP 4.10 Gear ~ BMR LCAs ~ CHE Relocation Brackets ~ BMR Adj Panhard ~ Prothane Motor Mounts ~ Coast Drive Shaft ~

June 11th, 2009, 11:31 AM	#13
bamagt Enthusiast Last Three of VIN 666 13.7@104mph Join Date: May 2008 Location: Alaska Posts: 503 iTrader: 0 reviews	dang AF.....how could you link the guy to a chevy motor? __________________ ~ 08 Alloy ~ JLT CAI ~ BBR Tunes ~ Comp Stage II NSRs ~ UDPs ~ MAC LT O/R Prochamber/Violators ~ Hurst STS ~ FRPP 4.10 Gear ~ BMR LCAs ~ CHE Relocation Brackets ~ BMR Adj Panhard ~ Prothane Motor Mounts ~ Coast Drive Shaft ~

June 11th, 2009, 11:35 AM	#14
usafimj I Post Entirely Way Too Much 2007 Ford Mustang GT 12.847 @ 114.12mph Join Date: Sep 2007 Location: Oklahoma City, Ok. Posts: 5,086 iTrader: 1 reviews	Well its not that I linked him to a chevy motor. I gave him a link to the basics which is where we all start to learn. __________________ 07 GT-- Gone But Not Forgotten Military Crew E-5

June 11th, 2009, 12:26 PM	#16
IronStomach Hardcore Enthusiast 2008 Mustang GT Join Date: Nov 2007 Location: West [of] Chicago Posts: 2,471 iTrader: 1 reviews	ooooh pretty pictures Direct injection is something Ford hasn't gotten to yet. There are some hopeful of seeing it turn up in the coyote, but even that probably won't have direct injection. __________________ Experience is what you get when you didn't get what you wanted.

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