Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 213 matches

by mt-engines
Thu Nov 26, 2020 8:03 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2143

Re: Big Issues with Cylinder Pressure (DCR)

Hi mtengines "........ [look at an L86 engine in a Cadillac Escalade.. 11.5:1 compression, 100,000 mile warranty towing capacity of 8,000+lbs Heck, I think it was 10 years ago when Mazda announced their Skyactive engines that run on regular pump fuel and is 14:1 compression." .........................
by mt-engines
Thu Nov 26, 2020 2:31 am
Forum: Engine Tech
Topic: Head Port Advice Old 409
Replies: 26
Views: 1247

Re: Head Port Advice Old 409

If these were my heads, I'd go with a slightly larger intake valve. Probably around 2.30". The main goal here is to redo your valve job. I'd find someone with a Sunnen VGS-20 and use the #17258 intake cutter. It's a 5-angle cutter that should improve your flow numbers by around 15 CFM or more at ea...
by mt-engines
Wed Nov 25, 2020 10:22 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2143

Re: Big Issues with Cylinder Pressure (DCR)

I can appreciate every point in this reply. For me personally, it's about incorporating "the stuff I have laying around" AND mixing it up with the current and more advanced thinking. This thread alone, which has contributions from the usual suspects, has shed some light on possible places where I m...
by mt-engines
Wed Nov 25, 2020 8:56 pm
Forum: Engine Tech
Topic: lifter valley paint or polish
Replies: 13
Views: 4720

Re: lifter valley paint or polish

fwiw ... it's actually glyptAL with an A. I still use 1201 & 1201A after block is baked & blasted; then hosed w/ lacquer thinner. But it's also true I'm still crazy. Last I bought off shelf at local GE Supply which has changed name to GEXPRO. Insides of alum cases of many many old Harley OE motors ...
by mt-engines
Wed Nov 25, 2020 7:52 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2143

Re: Big Issues with Cylinder Pressure (DCR)

David Redszus wrote: Wed Nov 25, 2020 7:07 pm Just to prove a point, Honda once built an engine with a compression ratio of 25 that ran on 25 octane fuel.
Not hard if you know how. :)
Was this a 2 stroke?
by mt-engines
Wed Nov 25, 2020 7:05 pm
Forum: Engine Tech
Topic: Radical/Ground Breaking Builds ?
Replies: 54
Views: 1972

Re: Radical/Ground Breaking Builds ?

The older generation grew up without internet and cell phones. They didn't have Amazon to order something online and have it on your doorstep the next day. Today's kids are spoiled by these things and take them for granted. The desire to build upon what we have is lost as you can always just buy so...
by mt-engines
Wed Nov 25, 2020 7:00 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2143

Re: Big Issues with Cylinder Pressure (DCR)

On that vette the dual electric fans are probabily a big mistake... Blocked airflow at speed... The factory GM system is better. big mech clutch fan proper fan shroud. Proper fan pulley speed. big rad with proper ducting to n front including the critical chin spoiler.. I see trouble. correct ductin...
by mt-engines
Wed Nov 25, 2020 6:48 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2143

Re: Big Issues with Cylinder Pressure (DCR)

Well why can't we run 87 octane with 13-1 SCR? Such a fuel would typically have a RON of 92 and a MON of 82. Engines obey MON values, not RON nor index values. Interesting but not helpful. Actually you can run 87 octane with a lot more compression ratio than that, been sitting on that technology fo...
by mt-engines
Sun Nov 22, 2020 9:50 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2143

Re: Big Issues with Cylinder Pressure (DCR)

DCR is just a bs formula for guys that have too much time to waste time plugging numbers into. Your build seems good. run it
by mt-engines
Sun Nov 22, 2020 9:13 pm
Forum: Engine Tech
Topic: Small cams on 106-108 LSA’s
Replies: 47
Views: 2129

Re: Small cams on 106-108 LSA’s

MT - i agree 1.4 is setting the bar high and i agree 1.3 is very reasonable as well, Hence me saying very few people get there. Randy 331 has had a couple of engines on the forum here. CGT special needs project 357ci,499 tq.,582hp.under 11.5 compression. Tony knight (knight engines) Holden engines ...
by mt-engines
Sun Nov 22, 2020 9:07 pm
Forum: Engine Tech
Topic: Small cams on 106-108 LSA’s
Replies: 47
Views: 2129

Re: Small cams on 106-108 LSA’s

skinny z wrote: Sat Nov 21, 2020 11:48 am
Can't comment on the BBC but at 1.4, 500 lb-ft out of 355 doesn't seem unreasonable.
[/quote]

I'm not saying unreasonable, but a lot more scienced out than just bolting some off the shelf parts together. The average guy wont get those results with shallow pockets and high expectations.
by mt-engines
Sat Nov 21, 2020 12:36 am
Forum: Engine Tech
Topic: Small cams on 106-108 LSA’s
Replies: 47
Views: 2129

Re: Small cams on 106-108 LSA’s

1.4 -1.45 for pump gas is what people should aim for,very few hit that target. For a NA unlimited engine EG - pro stock 1.65- 1.67 ft/lbs per cube [/quote] wow!! 1.45 lbft/ci na? pump gas? not happy dyno? I'm happy when i get 1.3. For me aiming for 1.4 would be setting the bar pretty high. I mean 6...
by mt-engines
Fri Nov 20, 2020 3:08 am
Forum: Engine Tech
Topic: DART Little M Block
Replies: 4
Views: 1099

Re: DART Little M Block

compguy wrote: Fri Nov 20, 2020 1:05 am Can the cam tunnel on the Little M be machined to 2.479" ?
are you wanting to go 55mm roller bearing? or 60mm babbit?

The answer is yes, but I have only done it in the .391" raised cam, and not the .434".
by mt-engines
Thu Nov 19, 2020 9:45 am
Forum: Engine Tech
Topic: Methanol Injection
Replies: 18
Views: 667

Re: Methanol Injection

Your friends must have very big gas tanks to burn "hundreds of gallons" a night. Yes they are too stupid to refill their 15 gallon fuel cells multiple times a night, so they installed 100 gallon tanks. #-o :roll: I'm not sure if you are aware of this. But there are these buildings on almost every h...
by mt-engines
Thu Nov 19, 2020 8:46 am
Forum: Engine Tech
Topic: Methanol Injection
Replies: 18
Views: 667

Re: Methanol Injection

Service station pump E85 is not held to the same blend formula as a racing fuel sourced E85. The pump station E85 is intended for "E85 Flex Fuel" vehicles that automatically adjust the EFI to the stuff in the tank... Not going to happen with a E85 carb. The E85 stuff in the pump can vary widely. So...