HT4100 4.1, 4.5, 4.9 Discussion, Engine Swaps and Expense in Cadillac Engine Discussion; Does anyone have any advice to give regarding engine swaps into an Eldorado to replace the 4100? Mine will not ...
- 08-31-03 09:03 PM #1Cadillac Owners Member
- Join Date
- Aug 2003
- Pelham, AL
Engine Swaps and Expense
Does anyone have any advice to give regarding engine swaps into an Eldorado to replace the 4100? Mine will not pull my hat from my head and with the hills around here I manage to squeeze out about 9 mpg. I am interested in reliability and compatibility with existing systems..
- 09-07-03 01:22 PM #2Cadillac Owners Member
- Join Date
- Feb 2003
- Tucson, Arizona
I have a 4100 engine with 105K in my '88 Allante which weighs about 3,200 lbs.
The car doesn't get out of town much and the A/C is on all the time (I live in Tucson!) and the average mileage comes up on the computer as 16.5. It moves up to 19 when I take the car on the road.
Granted, the 4100 may not have enough oomph for you, but I do think you can get better mileage out of it. As it appears that gasoline prices are going to settle in at $1.50 - $1.75/ gallon, you may want to re-think the swap idea and consider ways to increase the mileage of your present engine. Any swap to a more powerful engine will most likely mean LESS mileage so you'll have that expense AND the expense of the swap.
- 09-10-03 01:12 PM #3
Re: Engine Swaps and ExpenseOriginally Posted by Brian Bray
- 09-10-03 03:16 PM #4
I recommend 4,9 litre engine - lots of torque and enough power for cruising!
And - it must fit well - the block is same as your 4100 - just different heads, bore etc.
MPG must be allmost same too.
- 09-11-03 10:02 AM #5
Re: Engine Swaps and ExpenseOriginally Posted by vanaisa
- 09-11-03 04:57 PM #6
4,9 is east/west in newer Caddys, but i think, its not a big problem to put inline too...
If you want to keep your current transmission (THM325-4L four-speed overdrive automatic) - about it i dont know - i think maybe its too weak for this engine.
4,9 Eldo use 4T60-E electronically controlled four-speed automatic transmission with overdrive.
And - its consumption is about 16 mpg...
Thanks, somehow i like 67 Eldo too