With 340 HP I would not waste my time with a 7 1/4 rear. It may live for a while with an automatic but probably not too long.
As for the oil system. Whatever you use, a Low oil pressure cut off switch is really really cheap insurance.
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| Slant 6 Oil Pump https://www.slantsix.org/forum/viewtopic.php?t=59090 |
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| Author: | zimmerman@bright.net [ Mon Feb 08, 2016 9:29 am ] |
| Post subject: | Slant 6 Oil Pump |
Hello, While I have been on the forum for a while, this is my first post. I am building my first /6 Performance Engine. With all the concern regarding oil pump gears and the strain on the camshaft, has there been any consideration to replacing the mechanical oil pump with an electric one. I don't necessarily want to ruin the integrity of the / but I am converting to a MPFI, twin turbo setup, so integrity is already out the door. Any advice would be appreciated. Besides, with an electric oil pump, I can pre-lube. |
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| Author: | Reed [ Mon Feb 08, 2016 9:31 am ] |
| Post subject: | Re: Slant 6 Oil Pump |
Quote: Hello....I am converting to a MPFI, twin turbo setup
Really! Please share info about your build! I have nothing to say about an electric oil pump, though.
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| Author: | zimmerman@bright.net [ Mon Feb 08, 2016 10:04 am ] |
| Post subject: | |
Well, My 14 year old son fell in love with a 71 Valiant. Doing a complete restoration on it. After much debate with him, we decided to stay with the stock engine/trans and see what we could do. I could get into the car side of what we have done for the past year and a half but I guess that would be better for the A-body Forum. His Leaning Tower of Power has been bored .060, crank work etc. We shaved .020 off the block to improve compression ratio. We decided on a Clifford 268 Mechanical Cam Kit with double roller timing chain so we could match the existing stall speed on the converter. Its in front of a 904, fully converted with a reverse pattern manual shift valve body. We also found a Sure-grip rear end for that stock 7.25. (I'm praying it will take the abuse it going to see when my kid turns 16) So, I'm at the head now and getting very concerned about the lubrication of the engine. As I am sure most of us have I've sunk a ton of money in this build and don't want it to starve for oil the first time my kid decides to go to Norwalk. My plan is to shave .100 off the head, do a nice porting job and get some bigger valves to make the turbo's a little more effective. My MPFI is off of a 86 Fiero, still assembling all the pieces and parts. All in all this is a 14 year olds dream come true and If I can teach him about mechanics along the way we all win. I'm planning on 1.5 HP\CID. Lofty goal but I think I can get it done if I can hold the thing together. |
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| Author: | Reed [ Mon Feb 08, 2016 10:31 am ] |
| Post subject: | |
This should probably get moved to a new thread, but I think you are going to be getting into trouble with that much static compresison AND twin turbos, unles you keep boost levels very low. I encourage you to go to a more advanced fuel injection system that gives you more control over things like the timing in relation to boost. |
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| Author: | Rick Covalt [ Mon Feb 08, 2016 10:51 am ] |
| Post subject: | |
With 340 HP I would not waste my time with a 7 1/4 rear. It may live for a while with an automatic but probably not too long. As for the oil system. Whatever you use, a Low oil pressure cut off switch is really really cheap insurance.
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| Author: | Joshie225 [ Mon Feb 08, 2016 10:57 am ] |
| Post subject: | |
Engine oil pumps require several horsepower to drive at higher engine speeds. I urge you to look at a 1 hp motor and envision how you will package that motor and an oil pump. Then look to the electrical requirements of the motor and how you'll meet that load. Finally, look at external belt driven oil pumps. The other questions should be asked in the Boost and Nitrous section. However I will say that high compression and boost do not generally play well together and that most any stock EFI will have a hard time providing enough fuel without modification nor will they provide correct spark and fuel schedules without tuning. |
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| Author: | ProCycle [ Mon Feb 08, 2016 11:35 am ] |
| Post subject: | |
That 268 Clifford cam is probably not a very good choice for a turbo motor. Most turbo guys stick with something much closer to stock or an RV type grind. |
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| Author: | neilskiw [ Tue Feb 09, 2016 8:33 am ] |
| Post subject: | |
I, like some others, are reading mixed purposes into your build. As the owner of 3 teenagers, my comment would be that the last thing you want to do is put a 16 year old driver on the road with a vehicle that has roughly double its original power output. Unless you are also going to upgrade the brakes and suspension, this is a recipe for damage. If your child is truly interested, I love the build plan. But I recommend the modified engine be bolted to a stand and used as a future carrot for the completion of safe driving practices and vehicle maintenance performance expertise. Or just build a race car. With a cage, fire suppression system, and all the safety gear that will give you piece of mind as the car flies past in a blur. I recommend attending a Lemons or Chumpcar race. The pits are open, and the people are generally excited to share their experiences. The best part of the build is knowing exactly where your child is, and what they are doing. |
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| Author: | Dart270 [ Tue Feb 09, 2016 10:28 am ] |
| Post subject: | |
I would second the idea that you want a near-stock cam. 268 Comp is probably too big for a reasonable turbo 225 application. Oregon Cams can help you out. They made one for me with these specs: 224 deg @ 0.050" INT 219 deg @ 0.050" EXH 113 LSA 0.47 lift INT 0.437 lift EXH Lobe 1947i and 819e. Send Oregon your used cam and they will regrind it. The oil pump gear will be as stock and should not eat your oil pump gear. I would use a STOCK USED oil pump with 0.060" worth of washers under the relief spring. I would not even buy a new pump. This is the surest way to have a good pump that feeds your motor and will not fail. I have a 400 HP turbo 225 and this has all worked for me... Lou |
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| Author: | zimmerman@bright.net [ Tue Feb 16, 2016 7:23 am ] |
| Post subject: | |
Thanks for all the comments, certainly good advice. |
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